וּמִבְצַ֞ר מִשְׂגַּ֣ב חוֹמֹתֶ֗יךָ הֵשַׁ֥ח הִשְׁפִּ֛יל הִגִּ֥יעַ לָאָ֖רֶץ עַד־עָפָֽר׃ (ס)
И высокую крепость твоих стен Он разрушит, опустит и опустит на землю, даже в прах.
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.”