Meaning of “Trojan horse” in the English Dictionary

"Trojan horse" in British English

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Trojan horsenoun [ S ]

uk /ˌtrəʊ.dʒən ˈhɔːs/ us /ˌtroʊ.dʒən ˈhɔːrs/

literary a person or thing that joins and deceives a group or organization in order to attack it from the inside:

Older supporters have accused the new leadership of being a Trojan horse that will try to destroy the party from the inside.

also Trojan a computer program that has been deliberately designed to destroy information, or allow someone to steal it:

It's easier than you think to inadvertently download a malicious Trojan horse.

(Definition of “Trojan horse” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"Trojan horse" in Business English

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Trojan horsenoun [ C ]

uk us

someone or something in a system, organization, etc. that at first seems to be helpful, but then causes harm:

Critics called the 7% cap a Trojan horse for increasing taxes on the working poor.

IT a type of software, usually downloaded from the internet, that seems to be an ordinary program but that can destroy, or allow someone to steal, data:

Trojan horse program/malware/virus
It's easier than you think to inadvertently download a malicious Trojan horse.

(Definition of “Trojan horse” from the Cambridge Business English Dictionary © Cambridge University Press)