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