grindstone

(redirected from keep nose to the grindstone)
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Related to keep nose to the grindstone: keep one's nose clean

grindstone

1. 
a. a machine having a circular block of stone or composite abrasive rotated for sharpening tools or grinding metal
b. the stone used in this machine
c. any stone used for sharpening; whetstone
2. another name for millstone
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

grindstone

[′grīnd‚stōn]
(engineering)
A stone disk on a revolving axle, used for grinding, smoothing, and shaping.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

grindstone

A rotating solid stone wheel (usually sandstone) used for grinding, shaping, sharpening, or polishing.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

grindstone

or grind common metaphor for industriousness. [Pop. Culture: Misc.]
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.