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
Herminio	er-MEE-nyo	Spanish
Ainsley	AYNZ-lee	Scottish, English (Modern)
Tahmuras	-	Persian Mythology
Marielle	-	French
Morwen	-	Cornish, Welsh
Jules	[dʒu:lz]