Where does “oppedom” come from?

oppedom (Proto-Italic) comes from Proto-Indo-European ped- — to walk, to step; to stumble, to fall.

Ancestry of “oppedom”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	ped-	to walk, to step; to stumble, to fall

oppedom — Etymology, Origin & Word History | Etymology Explorer