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Turkey is planning strict security measures for the summit, including banning demonstrations and restricting access to roads leading to airports, as well as sealing off areas around the summit venue and hotels hosting delegations.—ABC News, 23 June 2026 Both the tinder storage and ferro tube sections of the Pen-metheus are sealed off with O-rings to prevent any moisture penetration.—New Atlas, 22 June 2026 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 See All Example Sentences for seal off