πολὺς ῥεῖν
From LSJ
ἀλλ' ἦν ἅπαντα τεταγμένα νόμων ἐπιταγαῖς → but all their acts were regulated by prescriptions set forth in laws
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