turncoat

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++turn·coat /ˈtɜːnkəʊt $ ˈtɜːrnkoʊt/ noun [countable]  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。

Examples from the Corpus

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.

turn·coat nounChineseSyllable  

Corpus supporting party someone stops a who political or

turncoat
turn‧coat /ˈtɜːnkəʊt $ ˈtɜːrnkoʊt/ noun [countable]
someone who stops supporting a political party or group and joins the opposing side:
    Casson was publicly criticized as a turncoat and a traitor.

turn·coatBrE /ˈtɜːnkəʊt/ 🔊NAmE /ˈtɜːrnkoʊt/ 🔊 noun (disapproving) a person who leaves one political party, religious group, etc. to join one that has very different views 叛徒；变节者；叛逆