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fifth column

noun

Definition of fifth column

  1. :  a group of secret sympathizers or supporters of an enemy that engage in espionage or sabotage within defense lines or national borders

fifth col·um·nism play \-ˈkä-ləm-ˌ(n)i-zəm\ noun
fifth col·um·nist play \-(n)ist\ noun


Origin of fifth column

name applied to rebel sympathizers in Madrid in 1936 when four rebel columns were advancing on the city


First Known Use: 1936


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