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3. be as sharp as a tack

be as sharp as a tack

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be as sharp as a tack

To be intelligent and a quick-thinker. Ted's as sharp as a tack, so he'll find a solution to this problem. Of course Ellen is our valedictorian—she's as sharp as a tack.

See also: sharp, tack

be as sharp as a tack

  (American)

to be very intelligent He may be old, but he's still as sharp as a tack.

See also: sharp, tack