turn·coat /-ˌkot/
背叛者,變節者
Turn·coat n. 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.
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turncoat
n : a disloyal person who betrays or deserts his cause or
religion or political party or friend etc. [syn: deserter,
apostate, renegade, recreant, ratter]