διϊστάνω
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
English (LSJ)
A = διΐστημι, Phld.Mort.27; τὴν φιλίαν D.S.19.46; τὸ πλῆθος App.Hisp.36:—also διϊστάω, D.T.642.31, Lyd.Mag.3.54.