χασμέομαι
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)
A = χασμάομαι, εἰς ταύταν χασμεύμενος Theoc.4.53.
German (Pape)
[Seite 1340] ion. u. poet. = χασμάομαι, εἴς τι Thuc. 4, 53.
