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English definition of “fifth column”

fifth column

noun [C]    
a group of people who support the enemies of the country they live in and secretly help themDisloyalty, betrayal and treason fifth-columnist     noun [C] a member of such a group Disloyalty, betrayal and treason
(Definition of fifth column noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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