συμμιγνύναι
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 συμμίγνυμι): mix, close with, come to blows, consult with, have intercourse with, have interview with, intermix with, mingle with, mix together, mix with, of combatants, of detachments joining a main body