D defs.my
Entry 1 sense Webster, 1913

Turncoat

/(tûrn"kōt`)/ · Turn·coat · IPA /ˈtɝn.koʊt/
01 n. One who forsakes his party or his principles; a renegade; an apostate; a defector to the enemy.
  1. 1.
    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.