Where does “clivus” come from?

clivus (Latin) comes from Proto-Indo-European ḱleywo-, from Proto-Indo-European ḱley-, from Proto-Indo-European ḱel- — to cover; to incline.

Ancestry of “clivus”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	ḱleywo-	—
2	Proto-Indo-European	ḱley-	to shelter, cover; to lean, slope, incline
3	Proto-Indo-European	ḱel-	to cover; to incline

clivus — Etymology, Origin & Word History | Etymology Explorer