ἀμπέτασον

From LSJ

φωνὰ τύ τίς ἐσσι καὶ οὐδὲν ἄλλο → it's all voice you are, and nothing else | it's all voice ye are, and nought else

Source

French (Bailly abrégé)

impér. ao. poét. de ἀναπετάννυμι.