ἔφαλσις
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
English (LSJ)
εως, ἡ, A bouncing on to a surface, Arist.Pr.913b30 (s.v.l.).
German (Pape)
[Seite 1112] ἡ, das Darauflosspringen, der Angriff.
Greek (Liddell-Scott)
ἔφαλσις: -εως, ἡ, τὸ ἐφάλλεσθαι ἐπί τινος, Ἀριστ. Προβλ. 16. 4, 4.
Russian (Dvoretsky)
ἔφαλσις: εως ἡ прыжок, скачок Arst.