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bust your ass(American very informal!)
to work very hard He'll just have to bust his ass to make sure the job is finished on time.
bust your ass/balls(American very informal!) also bust your arse (Australian very informal!)
to use a lot of effort to do something I busted my balls getting him that ticket, and now he's changed his mind! He bust his arse for ten years in that job and got no thanks for it.See burst a blood vessel