Grindstone
English Meaning
A flat, circular stone, revolving on an axle, for grinding or sharpening tools, or shaping or smoothing objects.
- A revolving stone disk used for grinding, polishing, or sharpening tools.
- A millstone.
- keep (one's) nose to the grindstone To work hard and steadily.
- put (one's) nose to the grindstone To work in earnest.