double-take


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doub·le-take

or double take  (dŭb′əl-tēm′)
n.
A delayed reaction to an unusual remark or circumstance after first either failing to notice anything unusual or reacting inappropriately, often performed as a comic device: "'Something's fishy,' Vidhu said again, with such a showboating shake of his head that I did a double take as I realized: he had some kind of inside scoop" (Katherine Russell Rich).