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bust ass
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 vesselbust ass
verbbust ass
verb