Grindstone

Pronunciation: /ˈɡraɪndˌstoʊn/

Grindstone (noun)

  1. A heavy stone wheel used to sharpen tools by rubbing their edges against it.
  2. A rotating stone used to grind materials into smaller pieces or smoother surfaces.

Examples

  • The grindstone is a tool for sharpening blades.
  • A grindstone helps you sharpen knives safely.