埋头苦干 (埋頭苦幹) mái tóu kǔ gàn

mái tóu kǔ gàn set phrase to bury oneself in work; to be engrossed in work; to make an all-out effort; up to the neck in work
Domain: Idiom 成语
Notes: (CC-CEDICT '埋頭苦幹')