ἐκ τοὔμπαλιν ἢ οἱ ἄνδρες αὐτῶν ὑπερέβαινον

From LSJ

τὸ ἀνάλημμα καὶ τὴν ἐπ' αὐτοῦ κερκίδα → the retaining wall and the wedge of theatre seats supported by it

Source