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.
See also: sharp, 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.
See also: sharp, tack

(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.
See also: sharp, tack
References in periodicals archive ?
The 'Charlie And The Chocolate Factory' star told NBC's "Today" show that Heard is a wonderful girl, who is sharp as a tack, wonderful, Southern belle and sweet as can be and good for him, the New York Post reported.
She's sharp as a tack and, like Margaret, mistress of the facial expression.
She's funny, sharp as a tack and the best interviewer around.
Ex-neighbour Fay Evans in Leigh-on-Sea, Essex, said: "She was as sharp as a tack right to the end.
Sharp as a tack, in a tone that varies from stiffly formal to sardonic and knowing, Jessica Peers writes a memoir of her years spent in a residential school for autis-youth.
Vanessa Middleton, 12 years old and sharp as a tack, saw Mrs.
She was sprightly, obviously as sharp as a tack and very steady on her legs.
She was sprightly, as sharp as a tack and very steady on her legs.