Where does “просити” come from?
просити (Old Church Slavonic) comes from Proto-Slavic prositi, from Proto-Balto-Slavic práśīˀtei, from Proto-Indo-European preḱ-, from Proto-Indo-European pr̥ḱneh₂.
просити (Old Church Slavonic): ask; demand
Ancestry of “просити”, step by step
Words derived from “просити”