To see Multiple Meanings of
grindstone
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Multiple Meanings
grindstone

Do you have a grindstone to sharpen the knife?
a revolving stone shaped like a disk that is used to grind, sharpen or polish

or:

work — as in the expressions "back to the grindstone" (back to work) or "keep your nose to the grindstone" (keep working hard)

Large grindstones that are used for grinding are also called millstones.
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