grindstone

(redirected from keep (one's) nose to the grindstone)
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Related to keep (one's) nose to the grindstone: fly off the handle

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

grindstone

[′grīnd‚stōn]
(engineering)
A stone disk on a revolving axle, used for grinding, smoothing, and shaping.

grindstone

A rotating solid stone wheel (usually sandstone) used for grinding, shaping, sharpening, or polishing.

grindstone

or grind common metaphor for industriousness. [Pop. Culture: Misc.]
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