trojan horse

Noun
  1. A subversive group that supports the enemy and engages in espionage or sabotage;
    An enemy in your midst (synset 108376680)
  2. A program that appears desirable but actually contains something harmful (synset 106597728)
    "the contents of a trojan can be a virus or a worm"; "when he downloaded the free game it turned out to be a trojan horse"
  3. A large hollow wooden figure of a horse (filled with Greek soldiers) left by the Greeks outside Troy during the Trojan War (synset 104493974)

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