sharp as a tack

Idioms & Phrases

sharp as a tack

Also, sharp as a razor. Mentally acute. For example, She's very wittyshe'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.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
Cite This Source
Explore Dictionary.com
Previous Definition: sharp apl
Next Definition: sharp bill
Words Near: sharp as a tack
More from Thesaurus.com
Synonyms and Antonyms for sharp as a tack
More from Reference.com
Search for articles containing sharp as a tack
More from Dictionary.com Translator
Dictionary.com Word FAQs

Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature