συμμαχήσειν (symmachesein)

συμμαχήσειν is an Ancient Greek form of συμμαχέω, meaning “be an ally, fight alongside”. It is the future active infinitive.

Found 29 times in the Ancient Greek texts on Socratos.

Where it is used

Plato, Menexenus 245: … ῆναι βουλόμενος ἐξῄτει τοὺς Ἕλληνας τοὺς ἐν τῇ ἠπείρῳ, οὕσπερ πρότερον Λακεδαιμόνιοι αὐτῷ ἐξέδοσαν, εἰ μέλλοι συμμαχήσειν ἡμῖν τε καὶ τοῖς ἄλλοις συμμάχοις, ἡγούμενος οὐκ ἐθελήσειν, ἵνʼ αὐτῷ πρόφασις εἴη τῆς ἀποστάσεως. καὶ τῶν μὲν …

All forms of συμμαχέω (conjugation table)

Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Liddell-Scott-Jones, A Greek-English Lexicon (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.