Where does “вы-” come from?
вы- (Russian) comes from Old East Slavic вꙑ-, from Proto-Slavic vy-, from Proto-Balto-Slavic ū́, from Proto-Indo-European úd — out, outward.
Ancestry of “вы-”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Old East Slavic | вꙑ- | — |
| 2 | Proto-Slavic | vy- | out |
| 3 | Proto-Balto-Slavic | ū́ | — |
| 4 | Proto-Indo-European | úd | out, outward |