Grindstone/ˈɡraɪndstəʊn/ Definition 1 of 2Pro Tip 1/3Tool Association Connect 'grindstone' with tools and manual labor in historical or craft contexts. The miller used the grindstone to produce flour. Pro Tip 2/3Visual Imagery Picture a large, wheel-shaped stone; it was traditionally turned by hand or animal power. The old grindstone still stood in the barn. Pro Tip 3/3Sharpening Context Specifically think of 'grindstone' when discussing sharpening metal objects like knives or tools. He turned the grindstone to sharpen the axe.