bustin' chops

to push someone to the limit of his abilities, especially someone's physical skill or prowess in his area of expertise; (probably originally musical slang)

You'll enjoy drumming for Karen, but you'd better keep up your practice -- the speed she wants during those long solos will bust your chops.

Working with platinum is bustin' my chops, I wish I could go back to working in silver.

Bustin' chops is his favorite thing to do on the midterm, so make sure you've memorized all the formulas.

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