Where does “grunduz” come from?

grunduz (Proto-Germanic) comes from Proto-Indo-European gʰrem-, from Proto-Indo-European gʰer- — to rub; to stroke; to grind.

grunduz (Proto-Germanic): ground, foundation

Definitions

Step	Language	Word	Meaning
1	Proto-Indo-European	gʰrem-	to be angry; to sound, bellow, growl, roar, be...
2	Proto-Indo-European	gʰer-	to rub; to stroke; to grind

grunduz — Etymology, Origin & Word History | Etymology Explorer