ακροβόλος

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

Source

Greek Monolingual

ἀκροβόλος, -ον (Α)
ο ακροβολιστής.
[ΕΤΥΜΟΛΟΓΙΑ < ἀκρο- (Ι) + -βόλος < βάλλω.
ΠΑΡ. ἀκροβολῶ].