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. My granddad may be old and cantankerous, but he's still sharp as a tack. You can't get anything past him.

See also: sharp, tack

See also:

(as) sharp as a tack
sharp as a tack
(as) sharp as a whip
wip
sharp as a needle
(as) sharp as a needle
smart as a whip
(as) smart as a whip
be as bright as a button
(as) bright as a button

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