dead giveaway
Noun

dead giveaway (plural dead giveaways)

  1. (idiomatic) Something that discloses, usually unintentionally, a fact or an intention.
    That disguise is a dead giveaway! Choose something less obvious.
    • 2008, New York Times ↗, March 5
      "Instead of slowing down his arm when he throws it — a dead giveaway to hitters — Igawa had better arm action, Eiland said"



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