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From Webster's Revised Unabridged Dictionary (1913) : [ web1913 ]
Grindstone \Grind"stone`\, n. A flat, circular stone, revolving on an axle, for grinding or sharpening tools, or shaping or smoothing objects. To hold, pat, or bring one's nose to the grindstone, to oppress one; to keep one in a condition of servitude. They might be ashamed, for lack of courage, to suffer the Laced[ae]monians to hold their noses to the grindstone. --Sir T. North.