διαυχενίζομαι
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 hold the neck erect, Eun.Hist.pp.263,272 D.
German (Pape)
[Seite 609] den Nacken zurückwerfen, eigtl. von Pferden, u. übertr., sich brüsten; Suid.; Poll. 1, 218.