work your 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!
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work your ass (or butt) offwork extremely hard. North American vulgar slang
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