Weak Knees
Weakness. Lack of vigor. Figuratively: a term for weak people in society.
("Strengthen the weak hands and make firm the feeble knees" - Isaiah 35:3, and also: "A man walks on the road and his strength is spent. His knees fail and his tongue is thirsty, I will give him drink" - Shai Agnon / In the Days of Her Youth)
Translation
Expression (Hebrew)
בִּרְכַּיִם כּוֹשְׁלוֹת
Definition (Hebrew)
חֻלְשָׁה. חֹסֶר מֶרֶץ. בְּהַשְׁאָלָה: כִּנּוּי לַאֲנָשִׁים הַחַלָּשִׁים בַּחֶבְרָה.
("חַזְּקוּ יָדַיִם רָפוֹת וּבִרְכַּיִם כֹּשְׁלוֹת אַמֵּצוּ"- יְשַׁעְיָהוּ לָהּ ג, וְכֵן:"אָדָם מְהַלֵּךְ בְּדֶרֶךְ וְכֹחוֹ כָּלֶה. בִּרְכָּיו כָּשְׁלוּ וּלְשׁוֹנוֹ בְּצָמָא נִשְׁתֶּה"- שַׁ"י עַגְנוֹן/ בִּדְמֵי יָמֶיהָ)