вы-

From Old East Slavic вꙑ- (vy-), from Proto-Slavic *vy- (“out”), from Proto-Indo-European *(H)ud (Derksen) or *ūd- : *ūt- (Černyx). In Slavic, the final consonant was dropped.

Cognates include English out, German aus (“out”).

• IPA^(key): [vɨ]
• IPA^(key): [ˈvɨ] (when stressed)

вы́- • (vý-) (this prefix almost invariably bears the stress in perfective verbs, but not in imperfective verbs)

1. (used with verbs) out, out from (describing an action of moving outside from inside)

   ‎вы́- (vý-) + ‎-йти́ (-jtí, “to go”) → ‎вы́йти (výjti, “to go out”)

2. (used with verbs) completion or fulfillment

   ‎вы́- (vý-) + ‎кури́ть (kurítʹ, “to smoke”) → ‎вы́курить (výkuritʹ, “to smoke to the end”)

• Vasmer, Max (1964–1973), “вы-”, in Etimologičeskij slovarʹ russkovo jazyka [Etymological Dictionary of the Russian Language] (in Russian), translated from German and supplemented by Trubačóv O. N., Moscow: Progress
• Černyx, P. Ja. (1999), “вы-”, in Istoriko-etimologičeskij slovarʹ russkovo jazyka [Historical-Etymological Dictionary of the Russian Language] (in Russian), volume 2, 3rd reprint edition, Moscow: Russkij jazyk, page 173