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Definition of “fifth column” - English Dictionary

"fifth column" in British English

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fifth columnnoun [C]

uk   /ˌfɪfθ ˈkɒl.əm/  us   /ˌfɪfθ ˈkɑː.ləm/
a group of people who support the enemies of the country they live in and secretly help 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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“fifth column” in English

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