Definition of sharp as a tack in English:

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sharp as a tack

North American Extremely clever or astute.
Example sentences
  • As a lawyer in Southern California with a mind that's sharp as a tack, it's not good to miss even one day (she's mega-prolific) of her blog.
  • It should be noted that his mind is sharp as a tack.
  • She's a lovely 77-year-old woman, sharp as a tack, without an enemy in the world.
See parent entry: sharp
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