Where does “съборъ” come from?

съборъ (Church Slavonic) comes from Proto-Slavic sъborъ, from Proto-Slavic borъ, from Proto-Balto-Slavic barús, from Proto-Indo-European bʰor- — to hum, buzz; coniferous forest; to protrude;...

Ancestry of “съборъ”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	sъborъ	meeting, gathering, assembly
2	Proto-Slavic	borъ	pine tree; set, assembly; loot
3	Proto-Balto-Slavic	barús	—
4	Proto-Indo-European	bʰor-	to hum, buzz; coniferous forest; to protrude;...

Words derived from “съборъ”

zbor

Every word from Proto-Indo-European bʰor- →Every word from Proto-Balto-Slavic barús →Every word from Proto-Slavic borъ →