ἐναγωνίζομαι
From LSJ
Νέος πεφυκὼς πολλὰ χρηστὰ μάνθανε → Dum floret aetas, disce, quod scitum decet → In jungem Alter lerne viel, was brauchbar ist
English (LSJ)
Ion. fut.
A -ιεῦμαι Hdt.3.83:—compete in a contest with, τινί Id.2.160, 3.83. 2 take part in, ἡτύχη ἐ. τοῖς τῶν ἀνθρώπων βίοις Plb.1.4.5, cf. 5.85.7. II ἐναγωνίσασθαι εὐμενῆ τοῖς Ἕλλησιν favourable for them to fight in, Th.2.74; πεδιὰς ἱππεῦσιν ἐ. ἐπιτή δειος Jul. Or.2.63d.