спеть (Russian) comes from Old East Slavic спѣти, from Proto-Slavic spěti, from Proto-Balto-Slavic spḗˀtei, from Proto-Indo-European spéh₁-, from Proto-Indo-European speh₁- — to succeed, to prosper.
спеть (Russian): to ripen; to sing; to crow
Definitions
to ripen; to sing; to crow
Ancestry of “спеть”, step by step
спеть traces back through two separate lines of ancestry.