Where does “pessemos” come from?

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

Ancestry of “pessemos”, step by step

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

pessemos — Etymology, Origin & Word History | Etymology Explorer