埋頭苦幹 [ㄇㄞˊ ㄊㄡˊ ㄎㄨˇ ㄍㄢˋ; mai2 tou2 ku3 gan4] to bury oneself in work (idiom); to be engrossed in work to make an all-out effort up to the neck in work ◄ ►