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To close something and bind the seals so it does not reopen. A noun or pronoun can be used between "seal" and "up." 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?
1. Sealed shut (by some means). That old house has been sealed up for nearly 15 years. The box was sealed up with three different locks.
2. Completely finalized or definitively resolved. We're hoping to have this deal sealed up by the end of the week. The whole thing's sealed up—there's nothing more I can do.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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?
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
mod. settled; secured; cinched. The matter was sealed by Monday morning.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.