Where does “plú-n-k-” come from?

plú-n-k- (Proto-Indo-European) comes from Proto-Indo-European plewk-, from Proto-Indo-European plew- — to fly, flow, run.

Ancestry of “plú-n-k-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	plewk-	to fly, flow, run; to splash, to flap with hands
2	Proto-Indo-European	plew-	to fly, flow, run

plú-n-k- — Etymology, Origin & Word History | Etymology Explorer