προσαφαιρέω
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 take away besides, τὸ δυνατόν τινος Max.Tyr.3.5:— Med., take away for oneself besides, D.20.35: c. dupl. acc., τὸν υἱὸν τὴν οὐσίαν π. Is.8.42:— Pass., to be removed as well, Gal.2.687; to be deprived of as well, τι J.AJ7.8.4, Luc.Am.36; πολλοὶ ταῖς ψυχαῖς καὶ ταφὴν -αφῃρέθησαν Lib.Or.19.60. II Pass. in Gramm., suffer further aphaeresis (of ἐθέλω, θέλω, λῶ), A.D.Adv.158.17.
German (Pape)
[Seite 753] (s. αἱρέω), noch dazu wegnehmen, med. noch dazu für sich wegnehmen, τινί τι, Is. 1, 2, Dem. 20, 35 u. Sp., wie Luc. amor. 36.