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It'll never fly

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It'll never fly.

Fig. It will never work!; It will never be approved! (Refers originally to an evaluation of an unlikely-looking aircraft of some type.) l have read your report and studied your proposal. It'll never fly. Your design for a new electric automobile is interesting, but it'll never fly!

See also: fly, never

It'll never fly.

  (American)

something that you say when you think an idea will not be successful He sent me a movie script but it'll never fly - it's just too unbelievable.

See also: fly, never