ἐπαληθεύειν

From LSJ

ὥσπερ γὰρ ζώου τῶν ὄψεων ἀφαιρεθεισῶν ἀχρειοῦται τὸ ὅλον, οὕτως ἐξ ἱστορίας ἀναιρεθείσης τῆς ἀληθείας τὸ καταλειπόμενον αὐτῆς ἀνωφελὲς γίνεται διήγημα → for just as a living creature which has lost its eyesight is wholly incapacitated, so if history is stripped of her truth all that is left is but an idle tale | for, just as closed eyes make the rest of an animal useless, what is left from a history blind to the truth is just a pointless tale

Source

Greek > English (Woodhouse Verbs Reversed)

(see also ἐπαληθεύω): verify, establish the truth of

Lexicon Thucydideum

verum declarare, confirmare, to declare the truth, prove, 4.85.1, 8.52.1.