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
Zoie	ZO-ee	English (Modern)
Nora	NAWR-ə (English), NO-rah (German)	Irish, English, Swedish, Norwegian, Danish, German, Dutch, Italian
Aldrin	['ɔ:ldrin]
Tertius	TUR-shəs (English)	Ancient Roman
Gallagher	['gæləhə]
Serge	SERZH	French