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.
Words nearby seal off
How to use seal off in a sentence
Although the blood-spattered offices will be off-limits, staff have vowed to continue producing the magazine.
A passing off-duty school safety officer named Fred Lucas said that he had been told the man was a drug dealer.
The NOPD fired Knight in 1973 for stealing lumber from a construction site as an off-duty cop.
The off-year special election into which Duke threw himself drew little media notice at first.
Aaron Paul may play a young Han Solo in the first Star Wars spin-off.Juiciest ‘Star Wars: The Force Awakens’ Rumors (and Some Debunked Ones)|Rich Goldstein|January 3, 2015|DAILY BEAST
A far-off volley rumbled over the plain, and a few birds stirred uneasily among the trees.The Red Year|Louis Tracy
In truth, it was so intently engaged with a sleeping seal that it had not observed the approach of the sledge.The Giant of the North|R.M. Ballantyne
With this I will end this letter, leaving it in this state until it is time to seal it, in case anything should occur to be added.
On breaking the seal, a letter at the top of a bundle of papers presented itself.The Pastor's Fire-side Vol. 3 of 4|Jane Porter
Richard Cromwell's parliament dissolved by commission under the great seal, at the instance of Desborough.The Every Day Book of History and Chronology|Joel Munsell