Where does “билинка” come from?

билинка (Ukrainian) comes from Ukrainian били́на, from Old East Slavic былина, from Old East Slavic бꙑти, from Proto-Slavic *byti, from Proto-Balto-Slavic bū́ˀtei, from Proto-Indo-European bʰuH- — to become, grow, appear.

Ancestry of “билинка”, step by step

StepLanguageWordMeaning
1Ukrainianбили́наbylina
2Old East Slavicбылина—
3Old East Slavicбꙑтиto be
4Proto-Slavic*byti—
5Proto-Balto-Slavicbū́ˀteito be
6Proto-Indo-EuropeanbʰuH-to become, grow, appear
Every word from Proto-Indo-European bʰuH- →Every word from Proto-Balto-Slavic bū́ˀtei →Every word from Proto-Slavic *byti →