The AI-powered English dictionary
third-person singular simple present seals off, present participle sealing off, simple past and past participle sealed off
(transitive) To physically isolate an area or building for security reasons preventing passage of humans or vehicles. quotations examples
More dangerous still are the 20 tonnes of melted fuel inside a reactor that caught fire in 1957 and has been sealed off and left alone ever since.
December 15 2022, Samanth Subramanian, “Dismantling Sellafield: the epic task of shutting down a nuclear site”, in The Guardian