Benedict Arnold is a name used in English to describe someone who is seen as a traitor—a person who seriously betrays a group, cause, country, organization, or allegiance they once supported. The expression comes from Benedict Arnold, an American Revolutionary War general who defected to the British and plotted to help them take control of West Point.
When used figuratively, Benedict Arnold suggests more than simply changing sides or disagreeing with a group. Instead, it points to meaningful betrayal or disloyalty, especially when the person previously supported or held a position of trust within that group.
- Meaning: A person viewed as a serious traitor or betrayer.
- Usage: A strong expression that compares someone’s actions with those of Benedict Arnold.
Knowing the historical story behind Benedict Arnold also helps you understand when the expression is appropriate and when a less serious term would be more accurate.
What Does “Benedict Arnold” Mean?
The Meaning in Simple Terms
In modern English, “Benedict Arnold” is a figurative label for a traitor. When someone is described as “a Benedict Arnold,” the speaker compares that person with the historical figure because of an alleged act of betrayal.
For example:
The employees called him a Benedict Arnold after he secretly shared confidential company information with a competitor.
The expression can apply to several situations. Someone might be called a Benedict Arnold for betraying an organization, team, political cause, or country. However, the central idea is not simply leaving or changing one’s mind. Rather, the person is viewed as having betrayed a meaningful allegiance or trust.
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Why “Benedict Arnold” Means “Traitor”
The expression comes from Arnold’s actions during the American Revolution. He originally served the American revolutionary cause and became a successful American military officer. Later, however, he secretly negotiated with the British and attempted to arrange the surrender of West Point.
As a result, his dramatic change from American officer to British defector became closely associated with betrayal. The Library of Congress notes that Arnold’s name became synonymous with “traitor” in the United States.
Therefore, calling someone a Benedict Arnold means more than saying that the person changed sides. It invokes the idea of betraying a side that the person had previously served or supported.
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Why Is Benedict Arnold Associated With Betrayal?
Who Was Benedict Arnold?
Benedict Arnold was an American general during the Revolutionary War. Before his betrayal, he had an important military record on the American side.
For example, in 1775, Arnold took part in the capture of Fort Ticonderoga and later led an expedition toward Quebec. He also played an important role in the fighting at Saratoga in 1777.
That earlier service matters because the modern expression depends on the contrast between Arnold’s service to the American cause and his later defection to the British.
What Did Benedict Arnold Do at West Point?
In 1780, Arnold received command of West Point, an important American military post on the Hudson River. While in command, he secretly negotiated with the British to surrender the fort.
Major John André served as the British contact in the plot. American forces captured André on September 23, 1780, and found papers connected with the plan. After learning that André had been captured, Arnold escaped to the British side.
The plan to surrender West Point failed. Arnold later served as a brigadier general in the British Army and led military operations against American forces.
Why Was Arnold’s Betrayal So Significant?
Arnold’s actions damaged his reputation because he had previously served as an American commander and held a position of trust at an important military post. He then attempted to use that position to help the opposing side.
George Washington and other American leaders treated Arnold’s actions as treason. More importantly for the expression’s later meaning, Arnold combined previous service, military authority, and an attempt to aid the British.
That combination made his betrayal especially memorable. Over time, Benedict Arnold became a lasting reference for a person viewed as seriously disloyal to a side they had previously served.
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How Did “Benedict Arnold” Become an Expression?
From a Person’s Name to a Figurative Label
There is an important difference between using Benedict Arnold as a person’s name and using it as a figurative label.
In a historical sentence, the name refers to the actual Revolutionary War general:
Benedict Arnold commanded the American post at West Point.
In a figurative sentence, the name describes someone else:
The team considered its former captain a Benedict Arnold after he secretly helped a rival team.
In the second example, the person is not literally Benedict Arnold. Instead, the speaker uses Arnold’s name as a historical comparison for someone considered seriously disloyal.
Why the Name Became a Symbol of Betrayal
Arnold’s name became closely linked with betrayal because his story has a clear contrast. He first served the American revolutionary cause, gained military authority, and later negotiated with the British to surrender an important American position.
The expression does not require a modern person to have committed an act identical to Arnold’s. Instead, the name works as a shorthand comparison. Calling someone a Benedict Arnold means the speaker sees that person’s behavior as resembling Arnold’s betrayal.
Why the Expression Is Especially American
The expression is closely connected to American history. To understand the reference fully, a reader needs to know who Benedict Arnold was and why his name became associated with betrayal.
An American reader familiar with the Revolutionary War may immediately recognize the reference. By contrast, someone unfamiliar with U.S. history may understand traitor but not know why the name Benedict Arnold carries that meaning.
For that reason, the expression is particularly associated with American English and American cultural history.
How to Use “Benedict Arnold” in Modern English
Common Sentence Patterns
The expression normally works as a noun phrase. Common patterns include:
- call someone a Benedict Arnold
- be called a Benedict Arnold
- consider someone a Benedict Arnold
- accuse someone of being a Benedict Arnold
For example:
The players called their former teammate a Benedict Arnold.
She was accused of being a Benedict Arnold after secretly helping the rival organization.
When the expression refers figuratively to one person, the article a is natural.
Examples in Different Contexts
Organization:
The board considered him a Benedict Arnold after he secretly gave the organization’s plans to a competing group.
Politics:
His former supporters called him a Benedict Arnold after he abandoned the cause and began helping its opponents.
Workplace:
The manager called the employee a Benedict Arnold after discovering that he had shared confidential information with a competitor.
Team or group:
The team saw its former captain as a Benedict Arnold because he deliberately gave the opposing team information about their strategy.
In each example, the person allegedly betrayed a meaningful allegiance or trust. Simply leaving a group does not necessarily justify the expression.
Literal vs. Figurative Use
Compare these two sentences:
Benedict Arnold was a general during the American Revolution.
Here, the name refers to the historical person.
The workers called their former manager a Benedict Arnold.
Here, the name is used figuratively to describe another person as a traitor.
This distinction is useful for English learners because the same name can refer either to the historical figure or to someone being compared with him.
When Is “Benedict Arnold” Appropriate to Use?
When Someone Betrays a Group or Cause
The expression fits best when someone appears to have betrayed a meaningful allegiance. This could involve a country, organization, political cause, team, or another group.
For example, secretly giving an organization’s confidential information to a competitor is much closer to the meaning of Benedict Arnold than simply resigning from the organization.
The comparison works particularly well when the person previously belonged to, supported, or was trusted by the group they later betrayed.
When Changing Sides Is Not Enough
Changing sides does not automatically make someone a Benedict Arnold.
Someone can:
- change political opinions;
- leave one employer for another;
- join a different team;
- disagree with former colleagues;
- criticize a group’s decisions; or
- end an association with an organization.
None of these actions necessarily involves betrayal.
The key question is whether the person actually betrayed an important allegiance or trust, rather than simply making a different choice.
When the Expression Is Too Strong
“Benedict Arnold” is an accusatory expression. Calling someone a Benedict Arnold can sound insulting, sarcastic, or deliberately dramatic.
For example, calling a coworker a Benedict Arnold because they accepted another job would probably exaggerate the situation. On the other hand, secretly giving confidential information to a competitor would provide a much stronger basis for the comparison.
When the facts are uncertain, a neutral description such as “changed sides,” “left the organization,” or “disagreed with the group” may be more accurate.
“Benedict Arnold” vs. “Traitor” vs. “Turncoat”
These terms overlap, but each emphasizes something different.
| Term | Main meaning | Typical tone |
| Benedict Arnold | Someone portrayed as betraying a side they previously supported | Strong and culturally loaded |
| Traitor | Someone who betrays a person, group, cause, or country | Strong and general |
| Turncoat | Someone who changes allegiance or sides | Strong, often political |
| Backstabber | Someone who secretly betrays or harms another person | Informal and personal |
Traitor is the broadest term. Benedict Arnold adds a specific historical comparison. Turncoat emphasizes a change in allegiance, while backstabber is more informal and often focuses on personal betrayal.
So, although the terms overlap, they are not interchangeable in every situation.
Grammar and Capitalization of “Benedict Arnold”
Is “Benedict Arnold” Capitalized?
Yes. Benedict Arnold remains capitalized when the expression is used figuratively because it comes from the proper name of a historical person.
For example:
The company accused him of being a Benedict Arnold.
The capitalization remains even when the name functions as a figurative label.
How to Use “a Benedict Arnold”
When referring figuratively to another person, a Benedict Arnold is a natural construction.
They considered him a Benedict Arnold.
She did not want to be known as a Benedict Arnold.
Here, the proper name functions as a noun phrase while retaining its capitalization.
Can You Say “Benedict Arnolds”?
Yes. The name can be pluralized when it refers figuratively to multiple people.
The organization was careful to identify potential Benedict Arnolds before sharing sensitive information.
This plural form is figurative. It does not refer to multiple historical men named Benedict Arnold.
“Benedict Arnold” Examples in Sentences
Examples Showing Correct Usage
The former executive was called a Benedict Arnold after secretly giving company plans to a competitor.
His supporters accused him of becoming a Benedict Arnold when he began working with their political opponents.
The coach was angry with the player for sharing the team’s strategy and called him a Benedict Arnold.
After the employee secretly helped the rival company, several coworkers described him as a Benedict Arnold.
Each example involves an alleged betrayal of trust, allegiance, or confidential information.
Examples That Show the Wrong Meaning
Maria disagreed with the manager’s decision, so her coworker called her a Benedict Arnold.
This is probably too strong if Maria simply expressed an opinion.
James left the company for a better job, and his old coworkers called him a Benedict Arnold.
Changing jobs alone does not establish betrayal.
The player transferred to another team, so the fans called him a Benedict Arnold.
A team change is not automatically an act of betrayal.
These examples show why context matters. The expression should describe serious perceived disloyalty, not every situation in which someone makes a choice that others dislike.
Common Misunderstandings About “Benedict Arnold”
Disagreement Is Not Betrayal
A person can disagree with a group while remaining loyal to it. Criticism, independent thinking, and different opinions are not automatically acts of betrayal.
Therefore, calling someone a Benedict Arnold simply because they challenge a decision can make the expression inaccurate.
Changing Allegiance Is Not Always Betrayal
Changing allegiance can be part of the meaning, but the change itself is not enough. A person may leave a political organization, change employers, or join another team without secretly betraying anyone.
The expression works best when the change involves a significant breach of loyalty or trust.
Not Every Opponent Is a “Benedict Arnold”
A competitor is not necessarily a traitor. Someone can oppose a group, compete against it, or hold different views without having betrayed it.
In short, Benedict Arnold describes betrayal, not simple opposition.
Is “Benedict Arnold” an Idiom?
Why the Name Is Used Idiomatically
The historical name is used figuratively to describe a person considered a traitor. In ordinary usage, calling someone “a Benedict Arnold” does not mean that the person is literally the historical general.
Instead, the expression relies on a shared historical reference. The listener connects Benedict Arnold with betrayal and then applies that association to another person.
The exact linguistic classification can vary. It is reasonable to describe the expression as an idiomatic or figurative use of a historical proper name. For everyday English, the key point is that “Benedict Arnold” has a figurative meaning beyond the historical person’s name.
Is It Used as a Common Noun?
Yes, it can function like a noun when used figuratively:
He was a Benedict Arnold.
The group feared there might be several Benedict Arnolds among them.
This noun-like use explains why the expression can appear with an article such as a and can also take a plural form.
Can “Benedict Arnold” Be Used in Formal Writing?
Formal and Informal Contexts
Yes, the expression can appear in formal writing when it accurately communicates the intended meaning. However, writers should remember that it is a strong accusation.
In a formal article, report, or professional discussion, it may be better to describe the specific conduct when factual precision matters more than the rhetorical comparison. For example, “he secretly provided confidential information to a competitor” is more precise than simply calling someone a Benedict Arnold.
Therefore, the expression works best when the historical comparison adds useful meaning rather than merely emotional force.
Political, Workplace, and Social Usage
The expression can appear in political, workplace, and social contexts. In each case, however, the situation should involve meaningful perceived betrayal.
In political language, it may describe someone accused of abandoning a cause or supporting former opponents. In workplace language, it might describe an employee accused of secretly helping a competitor. In social situations, it can describe someone who betrays a group or trusted relationship.
Because the term is loaded, writers should distinguish between a factual description of conduct and an accusation or opinion about that conduct.
Why “Benedict Arnold” Still Matters in American English
Historical Memory and Language
Historical figures can leave behind more than facts about their lives. Their names can become shorthand for ideas or behaviors that later generations recognize.
Benedict Arnold is a clear example. His name became associated with betrayal because of his attempted surrender of West Point and his subsequent service with the British.
As a result, the expression preserves a recognizable reference to that historical story in later English usage.
Why Non-Americans May Not Recognize the Reference
The meaning is easier to understand if the reader knows the basic story of the American Revolution.
Someone unfamiliar with Benedict Arnold may encounter the expression and wonder why a person’s name means “traitor.” In that situation, simply using traitor or briefly explaining the historical reference can make the meaning clearer.
This is one reason the expression can feel more culturally specific than the general word traitor.
How Historical Names Become Lasting Expressions
A historical person’s name can become a figurative label when that person’s actions become strongly associated with a particular quality or behavior. Later speakers can then use the name as a shorthand comparison.
In Arnold’s case, the relevant association is betrayal of a side he had previously served. His historical name therefore provides a compact way to make that comparison.
Frequently Asked Questions
Q1. Is “Benedict Arnold” always an insult?
Yes, when used figuratively, “Benedict Arnold” is usually negative and can sound insulting or accusatory. The speaker is comparing someone with a historical figure strongly associated with betrayal.
Q2. Can “Benedict Arnold” describe a woman?
Yes. The expression can describe any person who is viewed as having seriously betrayed a group, cause, or allegiance. It refers to the behavior, not the person’s gender.
Q3. What is the difference between “Benedict Arnold” and “turncoat”?
A turncoat is someone who changes allegiance or sides, while Benedict Arnold specifically suggests serious betrayal and invokes the historical example of Arnold. A person can change sides without necessarily being considered a Benedict Arnold.
Q4. Does “Benedict Arnold” mean the same thing as “backstabber”?
Not exactly. Backstabber usually refers to someone who secretly harms or betrays another person, especially in a personal or social situation. Benedict Arnold has a broader sense of betrayal and carries a specific historical reference.
Q5. Can “Benedict Arnold” be used jokingly?
Yes, speakers sometimes use the expression humorously or sarcastically for a relatively minor act of disloyalty. However, the expression still carries a strong association with betrayal, so the context and relationship between the speakers matter.
Q6. Do you need “a” before “Benedict Arnold”?
When the expression refers figuratively to one person, “a Benedict Arnold” is the natural form.
They called him a Benedict Arnold after he betrayed the organization.
When referring to the historical person, no article is needed:
Benedict Arnold was an American general during the Revolutionary War.
Conclusion
Use “Benedict Arnold” when you want to describe someone as seriously disloyal or as having betrayed a group, cause, or allegiance they previously supported. Because the expression carries a strong historical and accusatory meaning, it should not be used simply for disagreement, criticism, or changing sides.
If the situation involves a genuine breach of trust or loyalty, the comparison can be effective. Otherwise, a more neutral term such as traitor, turncoat, or a specific description of the person’s actions may be more appropriate.
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