Other forms: grits
Grit is tiny hard particles — the stuff spread on icy roads, or the speck that gets in your eye.
The literal sense is sand and crushed stone, and a gritter is the lorry that spreads it in winter. The figurative sense is one of the warmest words in English for character: having grit means carrying on through difficulty, and it is admiration rather than praise for talent. The verb is separate again, since to grit your teeth is to clamp them and endure, which is the same idea in the body.
Proto-Indo-European
*gʰrewd-
Proto-Germanic
*greutą
Proto-West Germanic
*greut
Old English
greot
Middle English
grete
English, today
grit
With early modern vowel shortening, from Middle English grete, griet, from Old English greot, from Proto-West Germanic greut, from Proto-Germanic greutą. Compare grist.
Etymology from Wiktionary, CC BY-SA