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grindstone /ˈgraɪnˌstoʊn/  

  • noun
    plural -stones
    [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.
    You'll do well at school if you just keep your nose to the grindstone.