埋頭苦幹

Simplified: 埋头苦干

máitóukǔgàn ㄇㄞˊ ㄊㄡˊ ㄎㄨˇ ㄍㄢˋ

    • to bury oneself in work (idiom) to be engrossed in work
    • to make an all-out effort
    • up to the neck in work

Character by character

Sources