Where does “painu” come from?

painu (Votic) comes from Votic paina, from Proto-Finnic painadak, from Proto-Uralic pajńa- — press.

Ancestry of “painu”, step by step

StepLanguageWordMeaning
1Voticpainato bend, flex
2Proto-Finnicpainadakto push, to press
3Proto-Uralicpajńa-press
Every word from Proto-Uralic pajńa- →Every word from Proto-Finnic painadak →Every word from Votic paina →