ETYM OE, greet, greot, sand, gravel, AS. greót grit, sant, dust; akin to OS griott, OFries. gret gravel, Old High Germ. grioz, German griess, Icel. grjôt, and to Eng. groats, grout. Related to Groats, Grout, Grail gravel.
A hard coarse-grained siliceous sandstone; SYN. gritrock, gritstone.

1. To clench together.
2. To cover with a grit.