Where does “horripilare” come from?

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

Ancestry of “horripilare”, step by step

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

horripilare — Etymology, Origin & Word History | Etymology Explorer