Where does “gъrbavъ” come from?

gъrbavъ (Proto-Slavic) comes from Proto-Slavic gъrbъ, from Proto-Indo-European ger- — to turn, bend, twist, wind; to tie, bind...

Ancestry of “gъrbavъ”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	gъrbъ	hump
2	Proto-Indo-European	ger-	to turn, bend, twist, wind; to tie, bind...