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get off your arse

(also get your arse in gear) offensive

Definition

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.Hurrying and doing things quicklyBusy and active
(Definition of get off your arse from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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