Where does “убы́ть” come from?
убы́ть (Russian) comes from Russian быть, from Old East Slavic бꙑти, from Proto-Slavic *byti, from Proto-Balto-Slavic bū́ˀtei, from Proto-Indo-European bʰuH- — to become, grow, appear.
убы́ть (Russian): to diminish, to decrease; (water) to become lower, to subside, to go down; (moon) to wane, to be on the wane
Definitions
- to diminish, to decrease; (water) to become lower, to subside, to go down; (moon) to wane, to be on the wane