be as sharp as a tack

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
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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