μύσσομαι
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
English (LSJ)
fut. μύξομαι Epic.in Arch.Pap.7.5:—
A blow the nose, μύσσονται δὲ οὐδέν Hp.Vict.3.70:—Act. (dub. in Hsch.) is only found in compds. ἀπο-, προ-μύττω. (Cf. μυκτήρ, μύξα (A); Skt. muncáti 'let go', Lat. e-mungo.)