Where does “співкурсниця” come from?

співкурсниця (Ukrainian) comes from Ukrainian співку́рсник, from Ukrainian спів-, from Ukrainian с-, from Proto-Slavic jьz-, from Proto-Slavic sъ(n), from Proto-Indo-European ḱóm, from Proto-Indo-European ḱe, from Middle English kyt — to bend; curve; arch; vault; to bow, bend, arch,...

Ancestry of “співкурсниця”, step by step

StepLanguageWordMeaning
1Ukrainianспівку́рсникcoursemate, fellow student
2Ukrainianспів-co- together, mutually, jointly
3Ukrainianс-used before: к, ф, п, т, х
4Proto-Slavicjьz-
5Proto-Slavicsъ(n)with, accompanying, alongside; with, by means of,...
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,...
Every word from Proto-Indo-European gū-Every word from Proto-Indo-European gʷet-Every word from Proto-Germanic kweduz