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grindstone

grind·stone

grindstone

 
pronunciation:
graInd ston
phrases:
keep one's nose to the grindstone, put one's nose to the grindstone
features:
Word Combinations (noun), Word Explorer
part of speech: noun
definition: a stone wheel that is rotated to sharpen implements or weapons, grind grain, or sand and shape items by abrasion.
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phrase: keep one's nose to the grindstone, put one's nose to the grindstone
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  grain, rock, stone