Meaning of “get off your arse” in the English Dictionary

british dictionary

"get off your arse" in British English

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get off your arse

also get your arse in gear offensive

to force yourself to start doing something or to make yourself hurry:

Tell him to get off his arse and do some work for once.
If she doesn't get her arse in gear, she's going to be late.

(Definition of “get off your arse” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)