fifth column

/ˌˈfɪ(f)θ ˌkɑləm/
IPA guide

Other forms: fifth columns

Definitions of fifth column
  1. noun
    a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst
    synonyms: Trojan horse
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    type of:
    social unit, unit
    an organization regarded as part of a larger social group
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