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get (one's) ass in gear
rude slang To start being active or prepare to do something, particularly when one is inactive. I know you said you would take out the trash, but get your ass in gear and do it already!I really need to get my ass in gear and finish writing this paper—it's due tomorrow!
get one’s ass in gear
and get one’s tail in gear
exclam. to get moving; to get organized and get started. (Usually objectionable.) Come on, you guys. Get moving. Get your ass in gear! Get moving, guys. Get your tail in gear and keep moving!