πολὺς ῥεῖν
From LSJ
εὐκαταφρόνητός ἐστι σιγηρὸς τρόπος → a way of life disposed to silence is contemptible (Menander)
Greek > English (Woodhouse)
be in full flood, flow with a strong current, flow with a strong stream, indulge in a flow of eloquence, indulge in flood eloquence