By surface analysis, *podъ- + *šьva, related to *šiti (“to sew”).
singular | dual | plural | |
---|---|---|---|
nominative | *podъšьva | *podъšьvě | *podъšьvy |
genitive | *podъšьvy | *podъšьvu | *podъšьvъ |
dative | *podъšьvě | *podъšьvama | *podъšьvamъ |
accusative | *podъšьvǫ | *podъšьvě | *podъšьvy |
instrumental | *podъšьvojǫ, *podъšьvǫ** | *podъšьvama | *podъšьvami |
locative | *podъšьvě | *podъšьvu | *podъšьvasъ, *podъšьvaxъ* |
vocative | *podъšьvo | *podъšьvě | *podъšьvy |
* -asъ is the expected Balto-Slavic form but is found only in some Old Czech documents; -axъ is found everywhere else and is formed by analogy with other locative plurals in -xъ.
** The second form occurs in languages that contract early across /j/ (e.g. Czech), while the first form occurs in languages that do not (e.g. Russian).