grindstone(redirected from keep nose to the grindstone)
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Related to keep nose to the grindstone: keep one's nose clean
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
A stone disk on a revolving axle, used for grinding, smoothing, and shaping.
A rotating solid stone wheel (usually sandstone) used for grinding, shaping, sharpening, or polishing.
or grind common metaphor for industriousness. [Pop. Culture: Misc.]