Definition of turncoat noun from the Oxford Advanced Learner's Dictionary

 

turncoat

 noun
noun
BrE BrE//ˈtɜːnkəʊt//
 
; NAmE NAmE//ˈtɜːrnkoʊt//
 
(disapproving)
 
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a person who leaves one political party, religious group, etc. to join one that has very different views
See the Oxford Advanced American Dictionary entry: turncoat