Meaning

noun a hard coarse-grained siliceous sandstone

noun fortitude and determination

verb cover with a grit

originFrom Middle English *gryt (“bran, chaff”), from Old English grytt, from Proto-West Germanic *gruti (“coarsely ground bits”), ablaut variant of Proto-Indo-European *gʰrewd-. See above. Doublet of goetta.

Etymology from Wiktionary, CC BY-SA 3.0