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English definition of “turncoat”

turncoat

noun [C]     /ˈtɜːŋ.kəʊt/ US  /ˈtɝːn-/ disapproving
a person who changes from one opinion to an opposite one in a way that shows they are not loyal to people who share the original opinion Disloyalty, betrayal and treason
(Definition of turncoat noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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