Where does “рꙋбити” come from?

рꙋбити (Old East Slavic) comes from Proto-Slavic rǫbiti, from Proto-Balto-Slavic ramˀb-.

Ancestry of “рꙋбити”, step by step

StepLanguageWordMeaning
1Proto-Slavicrǫbitito chop; to hem
2Proto-Balto-Slavicramˀb-—
Every word from Proto-Balto-Slavic ramˀb- →Every word from Proto-Slavic rǫbiti →