Mentally acute; very clever or intelligent. Also sharp as a razor.
Examples:
- She's very witty—she's sharp as a tack.
Origin: c. 1900; the razor variant from mid-1800s
Synonyms: quick as a whip, razor-sharp, bright as a button
Mentally acute; very clever or intelligent. Also sharp as a razor.
Examples:
Origin: c. 1900; the razor variant from mid-1800s
Synonyms: quick as a whip, razor-sharp, bright as a button