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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
Russian > Greek
ἀποφράγνυμι ;; ἀντιφράσσω ;; ἀντιφράττω ;; ἀπείργω
