bust (one's) ass

rude slang To work very hard. I've been busting my ass studying for this exam, so I really hope I get a good grade. We can't blow off Holly's party—she's been busting her ass cooking and cleaning and getting everything ready for company.

Common Names:

Name	Pronounced	Usage
Baish	[beiʃ]
Regena	-	English
Heida	HIE-dah	German
Bacharach	['bækəræk]
Mona (2)	-	Swedish, Norwegian, Danish
Constantijn	kawn-stahn-TIEN	Dutch