fifth column Definition in the Cambridge English Dictionary
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Definition of “fifth column” - English Dictionary

Definition of "fifth column" - British English Dictionary

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fifth columnnoun [C]

uk   us  
a ​group of ​people who ​support the ​enemies of the ​country they ​live in and ​secretlyhelp them
fifth-columnist
noun [C] uk   us  
a ​member of such a ​group
(Definition of fifth column from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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