προδότας
From LSJ
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
English (Slater)
προδότας
1 betrayer θανόντων δὲ καὶ φίλοι προδόται (Bergk: λόγοι φίλοι codd.) fr. 160.
