work (one's) ass off

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work (one's) ass off

rude slang To work really hard (on or at something). I know you thought it was just a silly New Year's resolution, but I've been working my ass off at the gym! Sally and Jim work their asses off when we hold our consumer conference each year. I don't know what I'd do without them!
See also: ass, off, work

work your ass (or butt) off

work extremely hard. North American vulgar slang
See also: ass, off, work

work one’s ass off

verb
See also: ass, off, work