trojan horse is a noun meaning "a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst". It carries 3 recorded senses.
a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst
a program that appears desirable but actually contains something harmful
“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”
a large hollow wooden figure of a horse (filled with Greek soldiers) left by the Greeks outside Troy during the Trojan War
Greece
Definitions, synonyms and semantic relations for trojan horse come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.