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sharp as a tack (not comparable)

  1. (simile, colloquial) very intelligent
    • 1999, Tina Koch et al., Still Me, Wakefield Press, pages 148 [1]:
      When Mum died at ninety she was still as sharp as a tack. Everything else wore out.
    • 2005, David E. Talbert, Love on the Dotted Line (page 12)
      But Ophelia was smart. Sharp as a tack. Everybody in the firm knew it.

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