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Phrase(s): why don’t you?
a question tag that is put onto the end of a command. • Andy: Move aside, why don’t you? Bob: Okay. Sorry. I didn’t know I was in the way. • "Just keep bugging me, why don’t you?" threatened Wally. • Andy: Try it again, why don’t you? Sue: I hope I get it right this time.
McGrawhill's American Idioms And Phrasal Verbs