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Meaning of grindstone

grind•stone

Pronunciation: (grīnd'stōn"), [key]
— n.
  1. a rotating solid stone wheel used for sharpening, shaping, etc.
  2. a millstone.
  3. to work, study, or practice hard and steadily or to cause someone to do so: If I put my nose to the grindstone, I'll finish the job this week.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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