Where does “hlædder” come from?

hlædder (Old English) comes from Proto-Germanic hlaidrijō, from Proto-Indo-European ḱley-, from Proto-Indo-European ḱel- — to cover; to incline.

Ancestry of “hlædder”, step by step

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

hlædder — Etymology, Origin & Word History | Etymology Explorer