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
ambĭ-dens:
I a sheep which has both upper and lower teeth, Paul. ex Fest. p. 4 Müll.
ambĭdēns, tis, f., brebis qui a les dents du haut et du bas : P. Fest. 4, 17.
ambidēns = bidens, Paul. ex Fest. 4, 17.
