Definition of seal verb from the Oxford Advanced Learner's Dictionary

      

    seal

     verb
    verb
    BrE BrE//siːl//
     
    ; NAmE NAmE//siːl//
     
    Verb Forms present simple I / you / we / they seal
    BrE BrE//siːl//
     
    ; NAmE NAmE//siːl//
     
    he / she / it seals
    BrE BrE//siːlz//
     
    ; NAmE NAmE//siːlz//
     
    past simple sealed
    BrE BrE//siːld//
     
    ; NAmE NAmE//siːld//
     
    past participle sealed
    BrE BrE//siːld//
     
    ; NAmE NAmE//siːld//
     
    -ing form sealing
    BrE BrE//ˈsiːlɪŋ//
     
    ; NAmE NAmE//ˈsiːlɪŋ//
     
    Describing architecture
     
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    close envelope
  1. 1  seal something (up/down) to close an envelope, etc. by sticking the edges of the opening together Make sure you've signed the cheque 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. See related entries: Describing architecture
  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. 4seal 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. 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. Word Originverb Middle English (in senses (2), (5) and (6)): from Old French seel (noun), seeler (verb), from Latin sigillum ‘small picture’, diminutive of signum ‘a sign’.Extra examples He sealed the bag tightly with sticky tape. Police sealed off the area. The containers must be carefully sealed so that no air can get in. The contracts are already signed and sealed. The nuclear plant would be effectively sealed off from the world. The unit is completely sealed. a hermetically sealed container The samples are kept in sealed plastic bags. The whole unit is sealed to prevent dust getting in. The windows and doors had been sealed up with bricks. Troops have sealed the border between the countries.Idioms used to say that you will not repeat somebody’s secret to other people
    ˌsigned and ˈsealed, ˌsigned, ˌsealed and deˈlivered
     
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    definite, because all the legal documents have been signed Alliteration in idioms
    Phrasal Verbsˈseal something in somethingˌseal somethingˈoff
See the Oxford Advanced American Dictionary entry: seal