mái​tóu​kǔ​gàn

engrossed

埋头苦干 (埋頭苦幹) mái​tóu​kǔ​gàn
engrossed idiom
to bury oneself in work; to be fully immersed or up to the neck in a task
work hard idiom
to make an all-out effort; to work with great diligence and persistence

Frequency

Movie subtitles
0.420 per million appears in 0% of films
Written text
1.36 per million

Sources

Definitions
CC-CEDICT