Where does “pūtian” come from?

pūtian (Old English) comes from Proto-Germanic putōną, from Proto-Indo-European bud- — to shoot, sprout; to swell.

Ancestry of “pūtian”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	putōną	to stick, stab, poke; to push
2	Proto-Indo-European	bud-	to shoot, sprout; to swell

pūtian — Etymology, Origin & Word History | Etymology Explorer