Where does “мешаться” come from?

мешаться (Russian) comes from Russian -ся, from Old East Slavic сѧ, from Proto-Slavic sę, from Proto-Balto-Slavic *sen, from Proto-Indo-European swé — self.

Ancestry of “мешаться”, step by step

Step	Language	Word	Meaning
1	Russian	-ся	Reflexive suffix appended to finite verbs and...
2	Old East Slavic	сѧ	—
3	Proto-Slavic	sę	oneself: myself, yourself, himself, herself,...
4	Proto-Balto-Slavic	*sen	—
5	Proto-Indo-European	swé	self

Words derived from “мешаться”

помешаться
помешательство

Every word from Proto-Indo-European swé →

мешаться — Etymology, Origin & Word History | Etymology Explorer