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English definition of “Trojan horse”

Trojan horse

noun [S] uk   /ˌtrəʊ.dʒənˈhɔːs/ us    /ˌtroʊ.dʒənˈhɔːrs/
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.Plotting and trappingPlanning, expecting and arrangingCheating and tricking (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 Learners Dictionary & Thesaurus © Cambridge University Press)
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