ἐπιδιαφθείρω
From LSJ
ὅτι μέντοι καὶ ἡ χρῆσις τῶν τρόπων, ὥσπερ τἆλλα πάντα καλὰ ἐν λόγοις, προαγωγὸν ἀεὶ πρὸς τὸ ἄμετρον, δῆλον ἤδη, κἂν ἐγὼ μὴ λέγω → however, it is also obvious, even without my saying so, that the use of figures of speech, like other literary adornments, is something that has always tempted toward excess
English (LSJ)
A destroy, ruin besides, in Pass., Ph. ap. Eus.PE8.14; become corrupt, Gal.8.42.
German (Pape)
[Seite 938] noch dazu verderben, Philo u. a. Sp.