ἀντιτιμωρεῖσθαι
From LSJ
Ἐλεύθερον φύλαττε τὸν σαυτοῦ τρόπον → Te liberum ipse moribus praesta tuis → Die Freiheit wahre deiner eignen Lebensart
Greek > English (Woodhouse Verbs Reversed)
(see also ἀντιτιμωρέομαι): avenge oneself on, revenge oneself on