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grindstone

noun

/ˈɡraɪndstoʊn/

Meaning

a thick disc of stone used for grinding, sharpening, or polishing tools

The blacksmith sharpened his blade on the grindstone.

keep your nose to the grindstone

sharpener, whetstone, millstone, polisher

blunt tool, dull edge

sharpen on grindstone, turn the grindstone, grindstone work

a person or thing that is mysterious, puzzling, or difficult to understand

A significant physical or mental transformation.

The quality of being economical with resources; avoiding waste.

The ability to make good judgments and quick decisions; keenness and depth of perception.

A small military camp or position at some distance from the main force, used especially as a guard.

the quality of being friendly and cheerful