ἐπαΐειν
From LSJ
Νὺξ μὲν ἀναπαύει, ἡμέρα δ' ἔργον ποιεῖ → Nam nox quietem praebet, facit opus dies → Die Nacht lässt unsre Arbeit ruhn, der Tag sie tun
Greek > English (Woodhouse Verbs Reversed)
(see also: ἐπαΐω) understand, be a professor of, be a specialist in