獨斷專行

Simplified: 独断专行

dúduànzhuānxíng ㄉㄨˊ ㄉㄨㄢˋ ㄓㄨㄢ ㄒㄧㄥˊ

    • to decide and act alone (idiom) to take arbitrary action
    • a law unto oneself

Character by character

Sources