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: From Middle Korean 스싀〮로〮 (susúy-lwó, “by oneself”), from Old Korean 自衣以 (SUSuy-lwo), from 自衣 (SUSuy, “oneself”) + 以 (-lwo, “by”, instrumental marker). The independent noun survived into fifteenth-century Middle Korean but is now lost.