nose to the grindstone
Used to form idioms meaning "to force someone to work hard or to focus intensely upon their work".
This Text holdeth their noses so hard to the grynde stone that it clean disfigureth their faces.
grindstone
UK /ˈɡɹaɪn(d)ˌstəʊn/ US /ˈɡɹaɪn(d)ˌstoʊn/
noun 2
Definitions
noun
1
An abrasive wheel for sharpening, polishing, or grinding.
2
Synonym of starry flounder.
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