Where does “grunnezzen” come from?

grunnezzen (Old High German) comes from Proto-Germanic grunnatjaną, from Proto-Germanic grunnōną, from Proto-Indo-European gʰrun- — to shout.

Ancestry of “grunnezzen”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	grunnatjaną	To grunt
2	Proto-Germanic	grunnōną	to grunt
3	Proto-Indo-European	gʰrun-	to shout

grunnezzen — Etymology, Origin & Word History | Etymology Explorer