(as) sharp as a tack(redirected from as sharp as a tack)
(as) sharp as a tack
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.
sharp as a tack
Also, sharp as a razor. Mentally acute. For example, She's very witty-she's sharp as a tack. These similes are also used literally to mean "having a keen cutting edge" and have largely replaced the earlier sharp as a needle or thorn. The first dates from about 1900, the variant from the mid-1800s.
(as) sharp as a ˈtack(American English) intelligent with a quick and lively mind: My grandmother’s 85 but she’s still sharp as tack.
A tack is a kind of small nail or pin.