Etymology
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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.

updated on January 06, 2018

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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
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.