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1. Oxford Dictionary

   grindstone

   • IPA[ˈɡrʌɪn(d)stəʊn]

   英式

   • n.
     a thick disc of stone or other abrasive material mounted so as to revolve, used for grinding, sharpening, or polishing metal objects.；another term for millstone

   • noun: grindstone, plural noun: grindstones

2. • 片語

   片語

   • keep one's nose to the grindstone