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
Ionas	-	Biblical Greek, Biblical Latin
Tanith	-	Near Eastern Mythology
DagnÝ	-	Ancient Scandinavian, Icelandic
BÈR	BER	Limburgish
Bailliff	['beilif]
Joisse	JOIS	English (Rare)