συμμαχεῖν
From LSJ
κρατίστην εἶναι δημοκρατίαν τὴν μήτε πλουσίους ἄγαν μήτε πένητας ἔχουσαν πολίτας → the best democracy is that in which the citizens are neither very rich nor very poor (Thales/Plutarch)
Greek > English (Woodhouse Verbs Reversed)
(see also συμμαχέω): be allied with, be allied, fight on the side of