Russian

Suffix

-сь • ‎(-sʹ)

1. contraction of -ся ‎(-sja) (reflexive suffix appended to finite verbs and infinitives to make a reflexive, reciprocal, or intransitive verb)

Usage notes

• After a vowel, -ся is usually contracted to -сь, except when attached to an adjectival participle:
  • мы́ться ‎(mýtʹsja, “to wash oneself”), мо́ется ‎(mójetsja, “[he] washes himself”)
  • мо́юсь ‎(mójusʹ, “[I] wash myself”)
  • мы́вшаяся ‎(mývšajasja, “[who had] washed herself”).