κοινολογεῖσθαι
From LSJ
σοφόν γάρ ἕν βούλευμα τάς πολλάς χεῖρας νικᾶ, σὺν ὄχλῳ δ' ἀμαθία μεῖζον κακό → better than many hands is one wise thought, a multitude of fools makes folly worse
Greek > English (Woodhouse Verbs Reversed)
(see also: κοινολογέομαι) be in agreement with, concert measures with, make common cause with, confer, confer with, have conference, have conference with
Lexicon Thucydideum
communicare consilia, to share plans, 4.74.2, 7.86.4, 8.63.4, 8.98.3.
