ξυμβῆναι (xymbenai)
ξυμβῆναι is an Ancient Greek form of συμβαίνω, meaning “happen, come to pass; agree”. It is the aorist active infinitive.
Found 51 times in the Ancient Greek texts on Socratos.
Where it is used
Thucydides, History of the Peloponnesian War 1.120.3: … , εἰ μὴ ἀδικοῖντο, ἡσυχάζειν, ἀγαθῶν δὲ ἀδικουμένους ἐκ μὲν εἰρήνης πολεμεῖν, εὖ δὲ παρασχὸν ἐκ πολέμου πάλιν ξυμβῆναι, καὶ μήτε τῇ κατὰ πόλεμον εὐτυχίᾳ ἐπαίρεσθαι μήτε τῷ ἡσύχῳ τῆς εἰρήνης ἡδόμενον ἀδικεῖσθαι.
Procopius, De Bellis 3.20.20: διὸ δὴ καὶ βασιλέα ἐς πόλεμον καταστῆναι Βανδίλοις, εἶναί τε οὐχ ὅσιον ξυμβῆναί τι πρὸς αὐτῶν ἄχαρι ἐς ἀνθρώπους ὧν τὴν ἐλευθερίαν ὑπόθεσιν ποιησάμενοι ἐπὶ Βανδίλους ἐστράτευσαν.
All forms of συμβαίνω (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.