An old man who forgot his Talmud, an old man who forgot his Talmud
A wise man whose knowledge was forgotten due to his old age or due to damage to his memory.
("And they remembered the old man who had forgotten his Talmud from the heat of his passion, saying: The tablets and the fragments of the tablets were placed before Aaron" - Blessings 8:2)
Translation
Expression (Hebrew)
זָקֵן שֶׁשָּׁכַח תַּלְמוּדוֹ, זָקֵן שֶׁנִּשְׁתַּכֵּחַ תַּלְמוּדוֹ
Definition (Hebrew)
חָכָם שֶׁיְּדִיעוֹתָיו נִשְׁכְּחוּ מִמֶּנּוּ עֵקֶב זִקְנָתוֹ אוֹ עֵקֶב פְּגִיעָה בִּיכֹלֶת הַזִּכָּרוֹן שֶׁלּוֹ.
("וְהִזָּהֲרוּ בְּזָקֵן שֶׁשָּׁכַח תַּלְמוּדוֹ מֵחֲמַת אָנְסוֹ, דְּאָמְרִינָן: לוּחוֹת וְשִׁבְרֵי לוּחוֹת מֻנָּחוֹת בָּאָרוֹן"-בְּרָכוֹת ח ע"ב)