turn·coat /ˈtɜːnkəʊt $ ˈtɜːrnkoʊt/ noun [countableC] BETRAYsomeone who stops supporting a political party or group and joins the opposing side 叛党者，变节者 Casson was publicly criticized as a turncoat and a traitor. 卡森被公开指责为叛党分子和叛徒。
turncoat• a mafia turncoat• And it's nothing more than what they deserve, for they're a band of turncoats.• Not all such turncoats are detected.