κοινωνεῖν
From LSJ
ὅπλον μέγιστόν ἐστιν ἡ ἀρετή βροτοῖς → man's greatest weapon is virtue, virtue is the greatest weapon for mortals
Greek > English (Woodhouse Verbs Reversed)
(see also κοινωνέω): associate with, be concerned in, communicate with, correspond with, have a share in, have dealings with, have intercourse with, have relations with, identify oneself with, join in, share in, take a share in, take part in