Many waters have flowed in the Jordan since then
By metaphor: much time has passed since then.
(Modern Hebrew)
Translation
Expression (Hebrew)
הַרְבֵּה מַיִם זָרְמוּ בַּיַּרְדֵּן מֵאָז
Definition (Hebrew)
בְּהַשְׁאָלָה: חָלַף מֵאָז הַרְבֵּה זְמַן.
(הָעִבְרִית הַחֲדָשָׁה)