κοινολογεῖσθαι
From LSJ
σοὶ μὲν παιδιὰν τοῦτ' εἶναι, ἐμοὶ δὲ θάνατον → This is sport to you but death to me (Aristotle, Eudemian Ethics 1243a20)
Greek > English (Woodhouse Verbs Reversed)
(see also: κοινολογέομαι) be in agreement with, concert measures with, make common cause with