UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈtɜːrnkəʊt/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈtɝnˌkoʊt/ ,USA pronunciation: respelling(tûrnkōt′)

WordReference Random House Learner's Dictionary of American English © 2020
turn•coat /ˈtɜrnˌkoʊt/USA pronunciation   n. [countable]
  1. one who changes to the opposite side, reverses principles, etc.;
    a renegade.

WordReference Random House Unabridged Dictionary of American English © 2020
turn•coat  (tûrnkōt′),USA pronunciation n. 
  1. a person who changes to the opposite party or faction, reverses principles, etc.;
  • turn + coat 1550–60

Collins Concise English Dictionary © HarperCollins Publishers::
turncoat /ˈtɜːnˌkəʊt/ n
  1. a person who deserts one cause or party for the opposite faction; renegade
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