προπαιδεύω
From LSJ
καὶ νῦν περὶ ἀρετῆς ὃ ἔστιν ἐγὼ μὲν οὐκ οἶδα, σὺ μέντοι ἴσως πρότερον μὲν ᾔδησθα πρὶν ἐμοῦ ἅψασθαι, νῦν μέντοι ὅμοιος εἶ οὐκ εἰδότι → so now I do not know what virtue is; perhaps you knew before you contacted me, but now you are certainly like one who does not know
English (LSJ)
A teach beforehand, in Pass., Pl.R.536d; πρὸς πάσας . . τέχνας ἔστιν ἃ δεῖ προπαιδεύεσθαι Arist.Pol.1337a19; ὑπό τινων S.E. M.6.29.
German (Pape)
[Seite 738] vorher unterrichten, τῆς προπαιδείας, ἣν τῆς διαλεκτικῆς δεῖ προπαιδευθῆναι, Plat. Rep. VII, 536 d.