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turncoat (n.)

1550s, from turn (v.) + coat (n.). The image is of one who attempts to hide the badge of his party or leader. The expression to turn one's coat "change principles or party" is recorded from 1570s.

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Definitions of turncoat from WordNet

turncoat (n.)
a disloyal person who betrays or deserts his cause or religion or political party or friend etc.;
Synonyms: deserter / apostate / renegade / recreant / ratter
From wordnet.princeton.edu