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grindstone

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grindstone/ˈgraɪnˌstoʊn/noun
pluralgrindstones
grindstone
/ˈgraɪnˌstoʊn/
noun
pluralgrindstones
Learner's definition of GRINDSTONE  
[count]
: a stone disc that can be turned like a wheel and that is used for sharpening tools, smoothing rough edges, etc.

nose to the grindstone

◊ If your nose is to the grindstone, you are doing hard, continuous work.
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