Where does “uppelus” come from?

uppelus (Finnish) comes from Finnish upota, from Proto-Finnic up'ot'ak — to sink; to drown.

Ancestry of “uppelus”, step by step

Step	Language	Word	Meaning
1	Finnish	upota	to sink; to get stuck in, get bogged down in; to...
2	Proto-Finnic	up'ot'ak	to sink; to drown

uppelus — Etymology, Origin & Word History | Etymology Explorer