κατὰ ῥοῦν
From LSJ
εὐλογητὸς ὁ Θεὸς ἡμῶν πάντοτε, νῦν καὶ ἀεὶ καὶ εἰς τοὺς αἰῶνας τῶν αἰώνων → blessed is our God always, now and ever, and to the ages of ages
Greek > English (Woodhouse)
down stream, with the current, with the stream, with the tide