Definition of sharp as a tack in English:
North American Extremely clever or astute.
- 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.
Definition of sharp as a tack in:
- US English dictionary
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