Where does “pleh₁-r-” come from?

pleh₁-r- (Proto-Indo-European) comes from Proto-Indo-European pleh₁- — to fill.

Ancestry of “pleh₁-r-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	pleh₁-	to fill

pleh₁-r- — Etymology, Origin & Word History | Etymology Explorer