φησὶν σιωπῶν

From LSJ

ἡμέραν δ' ἐξ ἡμέρας ῥίπτεις κυβεύων τὸν πρὸς Ἀργείους Ἀρη → day after day you cast your dice in war against the Argives, day by day you make your throw adventuring war against the Argives

Source

Greek > English (Woodhouse)

his silence gives consent