English

Definition of fifth columnist noun from the Oxford Advanced Learner's Dictionary

 

fifth columnist

 noun
noun
BrE BrE//ˌfɪfθ ˈkɒləmnɪst//
 
; NAmE NAmE//ˌfɪfθ ˈkɑːləmnɪst//
 
 
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a person who is working secretly to help the enemy of the country or organization they are in