Where does “spět” come from?
spět (Czech) comes from Old Czech [[vzpěti]], [[zpěti]], [[spěti]], [[spieti]], from Proto-Slavic spěti, from Proto-Balto-Slavic spḗˀtei, from Proto-Indo-European spéh₁-, from Proto-Indo-European speh₁- — to succeed, to prosper.
Ancestry of “spět”, step by step
Words derived from “spět”