συμμαχεῖν
From LSJ
διαφέρει δὲ ἡ κωμῳδία τῆς τραγῳδίας, ὅτι ἡ μὲν κωμῳδία ἀπὸ γέλωτος εἰς γέλωτα καταλήγει, ἡ δὲ τραγῳδία ἀπὸ θρήνου εἰς θρῆνον → comedy is different from tragedy, because comedy tapers off from laughter into laughter, but tragedy from lament into lament
Greek > English (Woodhouse Verbs Reversed)
(see also συμμαχέω): be allied with, be allied, fight on the side of