DictionaryRoot: grindan
Old English
grindan
to rub together, crush into powder
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noun
grinder
GRYNE-der/ˈɡraɪndər/
An implement that crushes or wears material down by pressure.
Etymology
A grinder was originally someone who ground grain; the same action-name later applied to a machine. Grinding also developed the sense of smoothing or sharpening by friction, explaining the tool’s broader uses.