Traditionally turned by hand, treadle, or water power, a grindstone restores an edge by wearing away dull or uneven metal. It belongs to farms, smithies, mills, and workshops, and its circular motion and shower of sparks make it visually striking. In poetry the grindstone may represent discipline, toil, and the sharpening of purpose, but also exhausting routine, especially in the phrase about keeping one's nose to it. Its steady abrasion can symbolise time, hardship, or labour reducing both tool and worker.

A grindstone is usually a rotating abrasive wheel, traditionally powered by hand, foot, water, or machinery. It sharpens tools by removing metal, so both blade and stone are gradually worn through use. In poetry this mutual abrasion can represent exhausting labour, discipline, preparation, or the cost of becoming effective. Sparks and circular motion provide strong visual imagery. Related terms include whetstone, oilstone, sharpening, blade, sparks, rotation, smithy, labour, routine, abrasion, readiness, and the familiar expression about keeping one's nose to the grindstone.