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Webster's New World College Dictionary » grindstone
grindstone
grindstone definition
grind·stone (grīnd′stōn′)
noun
- Now Rare a millstone
- a revolving stone disk for sharpening bladed tools or shaping and polishing things
grindstone Idioms
keep one's nose to the grindstone
or have one's nose to the grindstone or put one's nose to the grindstone to work hard and steadily
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