Where does “позавчера” come from?

позавчера (Russian) comes from Russian вчера, from Proto-Slavic vьčera, from Proto-Slavic večerъ, from Proto-Balto-Slavic wékeras, from Proto-Indo-European wekʷsperos.

позавчера (Russian): day before yesterday

Definitions

  1. day before yesterday

Ancestry of “позавчера”, step by step

позавчера traces back through 3 separate lines of ancestry.

via Russian вчера

StepLanguageWordMeaning
1Russianвчераyesterday
2Proto-Slavicvьčerayesterday
3Proto-Slavicvečerъevening
4Proto-Balto-Slavicwékerasevening
5Proto-Indo-Europeanwekʷsperos—

via Russian ПО

StepLanguageWordMeaning
1RussianПОsoftware
2Old East Slavicпоon, along, by
3Proto-Slavicpoafter; by; at
4Proto-Indo-Europeanh₂póoff, away
5Proto-Indo-Europeanh₂epofrom, off, back; off, away; off, from

via Russian за

StepLanguageWordMeaning
1Russianзаbehind; beyond; on the other side of; to; during
2Proto-Slaviczabehind, after (stationary)
Every word from Proto-Indo-European wekʷsperos →Every word from Proto-Balto-Slavic wékeras →Every word from Proto-Slavic večerъ →