θέμεναι

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

French (Bailly abrégé)

inf. ao.2 épq. de τίθημι.

English (Autenrieth)

see τίθημι.

German (Pape)

inf. aor.2 act. zu τίθημι.