σύρισμα
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)
[ῡ], ατος, τό, and συρ-ισμός, ὁ, later forms of σύριγμα, -μός; the former in Hsch.
A s.v. ἄσθμα, the latter in LXX Jd.5.16, al., Luc. Anach.32.
