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go arse over tit
vulgar slang To flip upside down; to flip head over heels. Can be used both literally and figuratively. My poor sister just went arse over tit on the ice out there! I hope she isn't hurt! If Bill sells the company, my whole world will go arse over tit—I mean, I'll have to find a new job after 25 years!
go arse over tit
fall over in a sudden or dramatic way.