Definition of grindstone noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈɡraɪndstəʊn//
; NAmE NAmE//ˈɡraɪndstoʊn//
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  • a round stone that is turned like a wheel and is used to make knives and other tools sharp
  • Idioms
    keep your nose to the grindstone
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    (informal) to work hard for a long period of time without stopping
    See the Oxford Advanced American Dictionary entry: grindstone