Where does “бꙑлъ” come from?

бꙑлъ (Old Church Slavonic) comes from Proto-Slavic *bylъ, from Proto-Indo-European bʰuH- — to become, grow, appear.

Ancestry of “бꙑлъ”, step by step

StepLanguageWordMeaning
1Proto-Slavic*bylъ—
2Proto-Indo-EuropeanbʰuH-to become, grow, appear
Every word from Proto-Indo-European bʰuH- →Every word from Proto-Slavic *bylъ →