埋頭苦幹

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

to bury

used in 埋怨[man2 yuan4]

to immerse oneself in / engrossed in sth / to lower the head (e.g. to avoid rain) / countersunk (of screws, rivets etc)

head / hair style / the top / end / beginning or end / a stub / remnant / chief / boss / side / aspect / first / leading / classifier for pigs or livestock / CL:個|个[ge4]

suffix for nouns

bitter / hardship / pain / to suffer / to bring suffering to / painstakingly

to work hard

tree trunk / main part of sth / to manage / to work / to do / capable / cadre / to kill (slang) / to fuck (vulgar) / (coll.) pissed off / annoyed