βεβαιοῦσθαι

From LSJ

Χρόνος δ' ἀμαυροῖ πάντα κεἰς λήθην ἄγει → Diesque celat omnia atque oblitterat → Die Zeit verdunkelt alles, gibt's dem Vergessen preis

Menander, Monostichoi, 545

Greek > English (Woodhouse Verbs Reversed)

(see also βεβαιόω): secure for oneself