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keep (one's) nose to the grindstone

 - 1 dictionary result
grind·stone   (grīnd'stōn')   
n.  

  1. A revolving stone disk used for grinding, polishing, or sharpening tools.

  2. A millstone.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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