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fifth column (n.)

1936, from Gen. Emilio Mola's comment at the siege of Madrid during the Spanish Civil War that he would take the city with his four columns of troops outside it and his "fifth column" (quinta columna) in the city.

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Definitions of fifth column

fifth column (n.)
a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst;
Synonyms: Trojan horse
From wordnet.princeton.edu

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