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hone
A hone is a machine tool use in the manufacture of precision bores to improve the geometry, surface finish and dimensional control of the finished part. This process is called honing.
Trivia about hone
This word meaning "to sharpen" comes from Old English for rock
It means to sharpen, but it's now used before "in on" to mean focusing on a target
To improve or perfect, it also means to sharpen on a whetstone