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seal off
Also, seal up. Close tightly or barricade to prevent entry or exit. For example, We're sealing off the unused wing of the building, or The jar is tightly sealed up. Dating from the first half of the 1900s, this idiom uses seal in the sense of “close securely,” as one used to do with a seal of wax.
Example Sentences
Police used barricades and razor wire to seal off major roads - especially those leading to State House and parliament.
According to the report, strikes on the heavily fortified enrichment facilities at Fordo and Natanz had sealed off entrances but failed to destroy underground structures.
Entrances to two nuclear facilities were sealed off, and some infrastructure was destroyed or damaged.
The apartment from which she vanished while her parents were having a meal at a nearby restaurant on the holiday complex was not properly sealed off, so vital forensic clues were lost.
The shopping centre has been evacuated and the area has been sealed off by police.
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