why doesn't (one) (do something)

why doesn't (one) (do something)

Used to form a suggestion or command. Why don't I go get us some ice cream while we wait for the train? Why doesn't everyone take a short break so we can clear our heads? A: "I just don't think you've thought this through." B: "Why don't you just shut your mouth, Gary?"
See also: why
Farlex Dictionary of Idioms.

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.
See also: why
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • why don't you?
  • say over
  • be on the market
  • why, oh why
  • how come
  • How come?
  • why on earth
  • why ever
  • why ever...?
  • It's anybody's guess