וּמִבְצַ֞ר מִשְׂגַּ֣ב חוֹמֹתֶ֗יךָ הֵשַׁ֥ח הִשְׁפִּ֛יל הִגִּ֥יעַ לָאָ֖רֶץ עַד־עָפָֽר׃ (ס)
너의 성벽의 높은 보장을 헐어 땅에 내리시되 진토에 미치게 하시리라
Rashi
concerning the droughts that He would bring famine upon them, and Menahem (Machbereth p. 47) classified it as an expression of fortification (מִבְצָר) like (Isaiah 25:12) “And the fortress of (וּמִבְצַר) the strength of your walls.”