Definition of seal verb from the Oxford Advanced American Dictionary

      

    seal

     verb
    verb
    NAmE//sil//
     
    Verb Forms present simple I / you / we / they seal
     
    he / she / it seals
     
    past simple sealed
     
    -ing form sealing
     
     
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    close envelope
  1. 1seal something (up/down) to close an envelope, etc. by sticking the edges of the opening together Make sure you've signed the check before sealing the envelope. a sealed bid (= one that is kept in a sealed envelope and therefore remains secret until all other bids have been received)
  2. close container
  3. 2[often passive] seal something (up) (with something) to close a container tightly or fill a crack, etc., especially so that air, liquid, etc. cannot get in or out The organs are kept in sealed plastic bags.
  4. cover surface
  5. 3[often passive] seal something (with something) to cover the surface of something with a substance in order to protect it The floors had been stripped and sealed with varnish.
  6. make something definite
  7. 4 seal something to make something definite, so that it cannot be changed or argued about to seal a contract They drank a glass of wine to seal their new friendship. Both firms hope to seal the deal soon. The discovery of new evidence sealed his fate (= nothing could prevent what was going to happen to him). She sealed victory with a birdie at the final hole.
  8. close borders/exits
  9. 5seal something (of the police, army, etc.) to prevent people from passing through a place Troops have sealed the borders between the countries.
  10. Idioms
    my lips are sealed
     
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    used to say that you will not repeat someone's secret to other people
    signed and sealed,signed, sealed, and delivered
     
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    definite, because all the legal documents have been signed
    Phrasal Verbsseal somethinginseal something in somethingseal somethingoff
See the Oxford Advanced Learner's Dictionary entry: seal