nose to the grindstone - Wiktionary
English [] Alternative forms []. nose-to-the-grindstone; Etymology []. Users lay on (often strapped to) a plank above the grindstone. First attested 1532, from John Frith's A Mirror to know Thyself: "This Text holdeth their noses so hard to the grindstone, that it clean disfigureth their faces.". Best guess: a water wheel "water mill" was used to grind wheat.
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