turncoat Meaning, Definition & Usage
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noun a disloyal person who betrays or deserts his cause or religion or political party or friend etc.
ratter; renegade; deserter; recreant; apostate.
WordNet
Turn"coat` noun
Definitions
One who forsakes his party or his principles; a renegade; an apostate; a defector to the enemy. He is a turncoat, he was not true to his profession. Bunyan.