τὸ λεγόμενον
From LSJ
Οὐκ ἔστι σιγᾶν αἰσχρόν, ἀλλ' εἰκῆ λαλεῖν → Silere non est turpe, sed frustra loqui → nicht Schweigen schändet, sondern Schwätzen auf gut Glück
Greek > English (Woodhouse)
according to the adage, as the phrase is, as the saying goes, as the saying is, in common parlance