Exhausted his strength (the wearing down of strengths)/ attrition
Caused his weakening (exhaustion implies weakening).
("What did Abraham do that he defeated the army of Nimrod the Chaldean, and Abimelech the king of Gerar?" - Yalkut Shimoni Torah Parashat Shemot Ramez Kesu, and so: "You have made my strength like a female, that I trembled over you, and you have stretched out my hand, for I saw that you were not afraid to draw near to him out of love" - Rasi Devarim 5:23)
Translation
Expression (Hebrew)
הִתִּישׁ אֶת כּוֹחוֹ (הַתָּשַׁת כּוֹחוֹת)
Definition (Hebrew)
גָּרַם לְהֵחָלְשׁוּתוֹ (הַתַּיִשׁ מַשְׁמָע הֶחֱלִישׁ).
("מֶה עָשָׂה אַבְרָהָם אֲשֶׁר הַתַּיִשׁ אֶת חֵיל נִמְרוֹד מֶלֶךְ כַּשְׂדִּים וְאֶת אֲבִימֶלֶךְ מֶלֶךְ גְּרָר"- יַלְקוּט שִׁמְעוֹנִי תּוֹרָה פָּרָשַׁת שְׁמוֹת רֶמֶז קסו, וְכֵן:"הִתַּשְׁתֶּם אֶת כֹּחִי כַּנְּקֵבָה שֶׁנִּצְטַעַרְתִּי עֲלֵיכֶם וְרִפִּיתֶם אֶת יָדִי כִּי רָאִיתִי שֶׁאֵינְכֶם חֲרֵדִים לְהִתְקָרֵב אֵלָיו מֵאַהֲבָה"- רָשִׁ"י דְּבָרִים ה כג)