work (one's) butt off

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 butt off at the gym! Sally and Jim work their butts off when we hold our user conference—I don't know what I'd do without them!

Common Names:

Name	Pronounced	Usage
NuallÁN	-	Ancient Irish
Beverley	BEV-ər-lee	English
Domitila	-	Spanish, Portuguese
GÉRaud	zhe-RO	French
Kirsi	KEER-see	Finnish
Myra	['mairə]