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In recent weeks, Iran has dramatically escalated efforts to seal off its cache of near bomb-grade uranium, deliberately collapsing tunnels and booby-trapping entrances with explosive mines, according to five sources familiar with US intelligence.—Jessie Yeung, CNN Money, 13 June 2026 Chemical warfare might be needed to control a serious invasion, but sealing off cracks and crevices that lead into your home, clearing debris and leaves from around your home, and keeping your lawn mowed will help.—Joan Morris, Mercury News, 8 June 2026 Security was intense and the gathering area before the march was completely sealed off.—Theia Chatelle, Sun Sentinel, 8 June 2026 Police and emergency officials sealed off traffic around the site, where twisted steel beams and shattered slabs of concrete hung precariously from the edge of the overpass.—ABC News, 26 May 2026 See All Example Sentences for seal off