Where does “zaostajati” come from?

zaostajati (Serbo-Croatian) comes from Serbo-Croatian ostajati, from Serbo-Croatian stàjati, from Proto-Slavic stojati, from Proto-Slavic stojěti, from Proto-Slavic -ěti, from Proto-Balto-Slavic -ēˀtei, from Proto-Indo-European -éh₁ti — Creates stative verbs from perfective roots;...

zaostajati (Serbo-Croatian): to fall behind, lag, drop back

Definitions

  1. to fall behind, lag, drop back

Ancestry of “zaostajati”, step by step

zaostajati traces back through two separate lines of ancestry.

via Serbo-Croatian ostajati

StepLanguageWordMeaning
1Serbo-Croatianostajatito stay, remain
2Serbo-Croatianstàjatito stand
3Proto-Slavicstojatito stand
4Proto-Slavicstojěti—
5Proto-Slavic-ětiInherited, stative; Deadjectival, inchoative;...
6Proto-Balto-Slavic-ēˀtei—
7Proto-Indo-European-éh₁tiCreates stative verbs from perfective roots;...

via Serbo-Croatian za

StepLanguageWordMeaning
1Serbo-Croatianzafor; behind, in back of, at; during
2Proto-Slaviczabehind, after (stationary)
Every word from Proto-Indo-European -éh₁ti →Every word from Proto-Slavic -ěti →Every word from Proto-Slavic stojěti →