ξυναγωνίζομαι

From LSJ

ὃ γὰρ βούλεται, τοῦθ' ἕκαστος καὶ οἴεται → what he wishes to be true, each person also believes to be true | what he wishes, each person also believes

Source

French (Bailly abrégé)

anc. att. c. συναγωνίζομαι.