turncoat
🇺🇸
/ˈtɜːrnkəʊt/
🇬🇧
/ˈtɜːnkəʊt/
someone who changes sides or betrays their beliefs for personal gain
When John switched political parties, his former colleagues accused him of being a turncoat.
ジョンが政治党派を変えたとき、元同僚たちは彼を裏切り者だと非難した。