συνεξανοίγω
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
English (LSJ)
A help one to open a way, c. dat., v.l. in J. BJ5.2.2.
Greek (Liddell-Scott)
συνεξανοίγω: ἀνοίγω ὁμοῦ, τινὶ Λεόντ. ἐν τῇ Φωτ. Βιβλ. 506. 1.