συνδιαφθείρω
From LSJ
κάλλιστον ἐφόδιον τῷ γήρᾳ ἡ παιδεία (Aristotle, quoted by Diogenes Laertius 5.21) → the finest provision for old age is education
English (LSJ)
A destroy at the same time, Arist.HA585a10, Jul.Or.1.24d; corrupt at the same time, ἑαυτῷ σ. καὶ τἄλλα Gal.15.874:—Pass., to be corrupted along with, ἡμῖν Isoc.8.41, cf. Din.3.19, Gal.15.697; συνδιαφθᾰρεὶς τῷ σώματι τὰς φρένας having his mind destroyed with . ., D.H.3.36: pf. συνδιέφθορα in pass. sense, D.S.38.15.
German (Pape)
[Seite 1008] mit od. zugleich verderben, vernichten, bestechen; συνδιέφθαρται ὁ δῆμος τῶν ῥητόρων τισί, Din. 3, 17: Isocr. 8, 41.