Part of speech: noun

A flat circular stone turning on an axis, for sharpening tools.

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Usage examples "grindstone":

  1. A throng of men and women crowded round a grindstone. - "The World's Greatest Books, Vol III", Arthur Mee and J.A. Hammerton, Eds..
  2. And yet the entire commissioned force felt that they were being kept at the grindstone because of the frivolity of these few youngsters, and they did not like it. - "The Deserter", Charles King.
  3. She declared she heard some one turning the grindstone. - "Under Padlock and Seal", Charles Harold Avery.