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grindstone noun

  /ˈɡɹaɪn(d)ˌstoʊn/ , /ˈɡɹaɪn(d)ˌstəʊn/ , /ˈɡɹɪnˌstoʊn/<q:obsolete><ref:{{R:Jespersen MEGoHP|I|4.35|123}}>
  • An abrasive wheel for sharpening, polishing, or grinding.
 mola
nose to the grindstone
lavoratore incallito, lavoratore indefesso
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