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