Where does “horrere” come from?

horrere (Latin) comes from Proto-Italic horzēō, from Proto-Indo-European ǵʰr̥séh₁(ye)ti.

Ancestry of “horrere”, step by step

Step	Language	Word	Meaning
1	Proto-Italic	horzēō	—
2	Proto-Indo-European	ǵʰr̥séh₁(ye)ti	—

horrere — Etymology, Origin & Word History | Etymology Explorer