συνναυμαχέω
From LSJ
ἵνα οὖν μηδ' ἐν τούτῳ δῷ αὐτοῖς λαβήν (Photius, Fragments on the Epistle to the Romans 483.26) → so that he doesn't give them even here a handle (= an opportunity for refutation)
English (LSJ)
A engage in a sea-fight along with, τισι Hdt.8.44, cf. Ar.Ra.702 (troch.), Th.1.73, IG12.108.41.
Greek (Liddell-Scott)
συνναυμᾰχέω: ναυμαχῶ ὁμοῦ μετά τινος, τινι Ἡρόδ. 8. 44, πρβλ. Ἀριστοφ. Βατρ. 702· ἐν Σαλαμῖνι ξυνναυμαχῆσαι Θουκ. 1. 73.