καταναυμαχεῖν
From LSJ
ἄλογον δὴ τὸ μήτε μάχης ἄρξασθαι μήτε τοὺς φίλους φυλάξαι, ἐὰν ὑπό γε τῶν βαρβάρων ἀδικῆσθε → It is irrational neither to begin battle nor to guard the friends, if you are ever wronged by the foreigners
Greek > English (Woodhouse Verbs Reversed)
(see also καταναυμαχέω): defeat at sea, defeat in a sea fight, defeat sea