He strengthened his arms
Exerted force with his hands. Figuratively: acted with effort.
("She girds her loins with strength and strengthens her arms" – Proverbs 31:17)
Translation
Expression (Hebrew)
אִמֵּץ זְרוֹעוֹתָיו, אימץ זרועותיו
Definition (Hebrew)
הִפְעִיל כּוֹחוֹת בְּיָדָיו. בְּהַשְׁאָלָה: פָּעַל בְּמַאֲמָץ.
("חָגְרָה בְעוֹז מָתְנֶיהָ וַתְּאַמֵּץ זְרֹעוֹתֶיהָ"- מִשְׁלֵי לֹא יז)