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turncoat

1 ENTRIES FOUND:
turncoat /ˈtɚnˌkoʊt/ noun
plural turncoats
turncoat
/ˈtɚnˌkoʊt/
noun
plural turncoats
Britannica Dictionary definition of TURNCOAT
[count] disapproving
: a person who stops being a member of a group in order to join another group that opposes it : traitor