someone's arse off

adv

He worked his arse off to finish the project on time.

意味（1）

(reflexive) With great effort, vigour or gusto, or to the point of excess.

I've been working my arse off all day for a measly few quid.

意味（2）

(reflexive) Used as a general negative intensifier: to an extreme degree.

I remember how we were all sweating our arses off during that heatwave.

意味（3）

(non-reflexive) So as to rigorously exercise or exhaust someone.

The boss has been working our arses off all week.