Definition of grindstone noun from the Oxford Advanced American Dictionary

 

grindstone

 noun
noun
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(informal)
     
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    to work hard for a long period of time without stopping
    See the Oxford Advanced Learner's Dictionary entry: grindstone