ἀπαληθεύω
From LSJ
έγ', ὦ ταλαίπωρ', αὐτὸς ὧν χρείᾳ πάρει. τὰ πολλὰ γάρ τοι ῥήματ' ἢ τέρψαντά τι, ἢ δυσχεράναντ', ἢ κατοικτίσαντά πως, παρέσχε φωνὴν τοῖς ἀφωνήτοις τινά → Wretched brother, tell him what you need. A multitude of words can be pleasurable, burdensome, or they can arouse pity somehow — they give a kind of voice to the voiceless | Tell him yourself, poor brother, what it is you need! For abundance of words, bringing delight or being full of annoyance or pity, can sometimes lend a voice to those who are speechless.
English (LSJ)
A speak the whole truth, πρός τινα X.Oec.3.12: c. acc., χρόνος ὁ πάντα ἐκκαλύπτων καὶ ἀπαληθεύων Ael.Fr.62.
German (Pape)
[Seite 276] die Wahrheit gerad heraussagen, Xen. Oec. 3, 12. Auch die Wahrheit erforschen; bewähren, Suid.