διόμνυσθαι
From LSJ
Μιμοῦ τὰ σεμνά, μὴ κακῶν μιμοῦ τρόπους → Graves imitatormores, ne imitator malos → Das Edle nimm zum Vorbild, nicht der Schlechten Art
Greek > English (Woodhouse Verbs Reversed)
(see also διόμνυμι): swear, bind oneself by oaths, make a deposition, take an affidavit, take an oath