grindstone Meaning, Definition & Usage
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noun a revolving stone shaped like a disk; used to grind or sharpen or polish edge tools
WordNet
Grind"stone` noun
Definitions
A flat, circular stone, revolving on an axle, for grinding or sharpening tools, or shaping or smoothing objects. They might be ashamed, for lack of courage, to suffer the Lacedæmonians to hold their noses to the grindstone. Sir T. North.