ἀντιδιδάσκω
From LSJ
Νικᾷ γὰρ αἰεὶ διαβολὴ τὰ κρείττονα → Calumniae mos vincere id, quod rectius → Verleumdung siegt stets über das, was besser ist
English (LSJ)
A inform, instruct in turn or on the other side, App.BC 5.19, AP6.236 (Phil.). II of dramatists, etc., contend for the prize, Ar.V.1410, cf. Satyr.Vit Eur.Fr.38.19, D.Chr.37.40.