give the show away


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give the (whole) show away

To reveal something that was meant to be kept secret, especially a plan. You're going to give the show away if you don't quit whispering about it! They were trying to sneak up on the other team, but John's bright T-shirt gave the show away.
See also: away, give, show

give the (whole) show away

demonstrate the inadequacies or reveal the truth of something.
See also: away, give, show