Trojan horse - definition and synonyms

noun [countable] 

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singularTrojan horse
pluralTrojan horses
  1. someone or something that seems good or helpful to a person or organization but whose real purpose is to harm or destroy them
    1. a.
      computing a program that seems useful but is designed to be harmful, for example by destroying information
Word story
In Homer’s epic poem The Odyssey, the Greek army besieging the city of Troy built a huge wooden horse and hid soldiers inside it, then pretended to leave. When the Trojans took the horse into the city, the Greek soldiers came out and opened the gates, allowing the city to be destroyed.