Where does “подъшьва” come from?
подъшьва (Old East Slavic) comes from Proto-Slavic *podъšьva, from Proto-Slavic šiti, from Proto-Balto-Slavic sjūtei, from Proto-Indo-European *syewH-.
подъшьва (Old East Slavic): sole ; foundation
Ancestry of “подъшьва”, step by step
Words derived from “подъшьва”