köken: With excrescent -t (same: eins > einst, su(n)s > sonst etc.) fossilized from the neutral gendered Middle High German sëlbes, from the Old High German pronoun sëlb, sëlbo, from Proto-Germanic *selbaz, from Proto-Indo-European *selbʰ- (“one's own”), from *s(w)e- (“separate, apart”). Compare Low German sulv, Dutch zelf, English self, Danish selv.
Reflexive suffix appended to finite verbs and infinitives to make a reflexive, reciprocal, intransitive or passive verb.
eş: -сь
köken: Etymology tree Proto-Indo-European *swé Proto-Balto-Slavic *sen Proto-Slavic *sę Old East Slavic сѧ (sę) Russian -ся From Old East Slavic сѧ (sę), from Proto-Slavic *sę, from Proto-Balto-Slavic *sen, from Proto-Indo-European *swé. It is considered the shortened form of себя́ (sebjá). Compare Belarusian and Ukrainian -ся (-sja), Italian -si, Spanish se.
köken: Lexicalization of mag (“body”) + -a (possessive suffix). This original meaning of the root word cannot be found in Hungarian, but it is attested in related languages.