Where does “-сь” come from?

-сь (Ukrainian) comes from Russian Си, from English c̄, from Latin cum, from Old Latin com, from Proto-Italic kom, from Proto-Indo-European ḱóm, from Proto-Indo-European ḱe, from Middle English kyt — to bend; curve; arch; vault; to bow, bend, arch,...

-сь (Ukrainian): Appended to relative/interrogative pronouns to...

Definitions

  1. Appended to relative/interrogative pronouns to...

Ancestry of “-сь”, step by step

-сь traces back through two separate lines of ancestry.

via Russian Си

StepLanguageWordMeaning
1RussianСиA particular high-level programming language from which many others are derived
2EnglishWith
3Latincumwith, along with; at; -fold
4Old LatincomAlternative form of cum
5Proto-Italickomwith, along, at
6Proto-Indo-Europeanḱómbeside, near, by, with
7Proto-Indo-EuropeanḱeDeictic particle, here; Post-positional...
8Middle Englishkyt
9Germankittputty certain kinds of cement used for fixing e.g. window panes
10Old High Germankuti
11Proto-West Germanickwidugum, resin
12Proto-Germanickweduzresin
13Proto-Indo-Europeangʷet-resin, gum; to say, speak
14Proto-Indo-Europeangū-to bend; curve; arch; vault; to bow, bend, arch,...

via Proto-Slavic

StepLanguageWordMeaning
1Proto-Slavicthis
2Proto-Balto-Slavicśisthis here
3Proto-Indo-Europeanḱísthis
4Proto-Indo-Europeanísthis, he (used as the 3rd person pronoun)

Words derived from “-сь

Every word from Proto-Indo-European gū-Every word from Proto-Indo-European gʷet-Every word from Proto-Germanic kweduz