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
ὀγκότερος: [compar. к ὄγκος II] более напряженный, расширенный, увеличенный (ἡ σάρξ Arst.).