The idiomatic meaning of "a trojan horse" refers to something that seems good or beneficial on the surface but actually conceals a hidden threat, danger, or ulterior motive. It implies a deceptive tactic where something is presented innocently to gain access or acceptance, only to reveal its harmful nature later.
The expression originates from the ancient Greek legend of the Trojan War. The Greeks, unable to breach the walls of Troy after a long siege, built a giant wooden horse and left it as a supposed gift. The Trojans, believing it to be a peace offering, brought the horse inside their city walls. During the night, Greek soldiers hidden inside the horse emerged and opened the city gates, leading to the fall of Troy.
The register is generally neutral, suitable for both formal and informal contexts, depending on the subject matter being discussed.
"A trojan horse" can be used as a noun phrase, often with articles (a, the) or possessive pronouns (my, your, their). It can be modified by adjectives to further specify the nature of the hidden threat (e.g., "a dangerous Trojan horse"). It can also be used in questions or negative statements.
Over-literal use can sound unnatural. For example, referring to an actual wooden horse as "a trojan horse" outside the specific context of the Trojan War would be unusual. Using it to describe something obviously dangerous, without any pretense of innocence, would also be a misapplication.
"A Trojan horse?" — The Guardian - Books
"Essentially a Trojan horse in the coding." — The New Yorker
"Is this gift a Trojan horse?" — The New York Times
""This is nothing but a Trojan horse." — The New York Times
"He said it was a Trojan horse for complete legalization." — The New York Times
Examples sourced from https://ludwig.guru/s/a+trojan+horse
| Phrase | Context |
|---|---|
| wolf in sheep's clothing | Something or someone dangerous pretending to be harmless. |
| Trojan gift | A gift with malicious intent, echoing the original story more closely. |
| hidden agenda | A secret plan or motive behind an action or statement. |
| ulterior motive | A reason for doing something that is kept hidden. |
| deceptive ploy | A cunning plan designed to trick someone. |
| double-edged sword | Something that appears beneficial but has negative consequences. |
| Pandora's Box | Something that seems harmless but unleashes unforeseen problems. |
Learners often use it literally or fail to grasp the figurative meaning of hidden danger or subversion within something seemingly benign.
| Expression | Idiomatic Meaning | Register | Avoid In |
|---|---|---|---|
| a trojan horse | Something that appears harmless or beneficial but contains a hidden threat or ulterior motive. | Neutral | Situations lacking deception or hidden danger; literal references to horses outside the Trojan War context. |
While the term originates from a literal event, in modern usage, "a trojan horse" is almost always used figuratively. It describes situations where something seemingly innocent or beneficial conceals a hidden danger or ulterior motive. The literal reference to a wooden horse is rare outside discussions of Greek mythology.
Both phrases describe something dangerous disguised as harmless. However, "a trojan horse" emphasizes the deceptive entry or acceptance of something harmful, while "a wolf in sheep's clothing" highlights the inherent nature of the danger being masked by a harmless appearance. A trojan horse gains entry through deception, while a wolf in sheep's clothing is inherently dangerous pretending to be harmless.
A common mistake is using "a trojan horse" to simply describe something bad or unfortunate, without the key element of deception or hidden danger. To avoid this, ensure that the situation involves something presented as good or harmless that later reveals a concealed threat or negative purpose. If there's no element of disguise or hidden intent, a different phrase might be more appropriate.
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