κολυμπιστής
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
Greek Monolingual
ο (Μ κολυμβιστής)
κολυμβητής.
[ΕΤΥΜΟΛ. Ο τ. κολυμπιστής < μσν. κολυμβιστής < κολυμβίζω].
