seal (something) up

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seal (something) up

To close something and bind the seals so it does not reopen. They're going to seal up the door leading into the cellar. Would you please seal this box up for me so I can get it in the mail?
See also: seal, up

seal something (up) (with something)

to fasten something closed with something. Please seal this box up with twine. Would you seal up this box with tape?