He has no answer in his mouth
Unable to respond to the arguments raised against him.
("And Elihu saw that there was no answer in the mouths of the three men, and his anger was kindled" - Job 32:5)
Translation
Expression (Hebrew)
אֵין מַעֲנֶה בְּפִיו
Definition (Hebrew)
לֹא יָכוֹל לְהָשִׁיב לַטְּעָנוֹת שֶׁהָעֳלוּ כְּנֶגְדּוֹ.
("וַיַּרְא אֱלִיהוּא כִּי אֵין מַעֲנֶה בְּפִי שְׁלֹשֶׁת הָאֲנָשִׁים וַיִּחַר אַפּוֹ"- אִיּוֹב לֵב ה)