Where does “ἐξεῖπον” come from?

ἐξεῖπον (Ancient Greek) comes from Ancient Greek εἶπον, from Proto-Hellenic eweikʷom, from Proto-Hellenic eweukʷom, from Proto-Indo-European wéwket, from Proto-Indo-European wekʷ- — to speak, to sound out.

ἐξεῖπον (Ancient Greek): to speak out