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
ὑπερβαίνω, ἐάω, παρατρέχω, ὑποσιωπάω, παραλείπω, διασιωπάω, παρασιωπάω, κατασιωπάω, ἀπολείπω, σιωπάω, σιγάω