Where does “πειραίνω” come from?

πειραίνω (Ancient Greek) comes from Ancient Greek πεῖραρ, from Proto-Indo-European pérwr̥, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Ancestry of “πειραίνω”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πεῖραρ	cord, rope; ends, limits
2	Proto-Indo-European	pérwr̥	ford, crossing; rock; mountain
3	Proto-Indo-European	per-	before, in front; first; to go through
4	Proto-Indo-European	pr̥tós	passed , crossed

Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Indo-European pérwr̥ →