ἀντιπολεμεῖν
From LSJ
ὁ ναύτης ὁ ἐν τῇ νηῒ μένων βούλεται τοὺς τέτταρας φίλους ἰδεῖν → the sailor staying on the ship wants to see his four friends
Greek > English (Woodhouse Verbs Reversed)
(see also ἀντιπολεμέω): wage war against
Lexicon Thucydideum
bellum vicissim inferre, to wage war in turn, 3.39.2.
inter se bellare, to fight with each other, 1.23.2.