Where does “greyb-” come from?

greyb- (Proto-Balto-Slavic) comes from Proto-Indo-European gʰreyb-, from Proto-Indo-European gʰer- — to rub; to stroke; to grind.

Ancestry of “greyb-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	gʰreyb-	to grab, grasp; to grasp, grab; to grab, to grasp
2	Proto-Indo-European	gʰer-	to rub; to stroke; to grind

greyb- — Etymology, Origin & Word History | Etymology Explorer