Where does “pkw-il-” come from?

pkw-il- (Proto-Georgian-Zan) comes from Proto-Kartvelian pek-, from Proto-Kartvelian pk- — to grind.

Ancestry of “pkw-il-”, step by step

Step	Language	Word	Meaning
1	Proto-Kartvelian	pek-	—
2	Proto-Kartvelian	pk-	to grind

Words derived from “pkw-il-”

Every word from Proto-Kartvelian pk- →Every word from Proto-Kartvelian pek- →