phrasal verbphr vSTOP something THAT IS HAPPENINGto stop people from entering an area or building, because it is dangerous 〔因有危险而〕封闭,封锁〔某地区或某幢建筑〕
Following a bomb warning, police have sealed off the whole area.
接到有炸弹的警告后,警方封锁了整个地区。
Examples from the Corpus
seal off• In Dresden police removed about 3,000 people from the station and sealed it off.• These glades get fainter, and shadows rise to seal them off.• There the whales deliberately tilt the floes so that seals slide off into the water and into the jaws of their attackers.• Press down the edges to seal and trim off the excesspastry.