Longman Dictionary of Contemporary English homepage

seal

2 verb
     
seal2 [transitive]
1 also seal up to close an entrance or a container with something that stops air, water etc from coming in or out of it:
The window was sealed shut.
seal a joint/crack/opening/gap
A quick way to seal awkward gaps is to use a foam filler.
Dried milk is kept in hermetically sealed (=very tightly closed) containers.
2 if a building, area, or country is sealed, no one can enter or leave it:
Authorities plan to seal the border.
3 to close an envelope, package etc by using something sticky to hold its edges in place:
He wrote the address and sealed the envelope.
4 to cover the surface of something with something that will protect it:
Wooden decks should be sealed to prevent cracking.
5

seal somebody's fate

to make something, especially something bad, sure to happen:
The outbreak of war sealed the government's fate.
6

seal a deal/bargain/pact etc

to make an agreement more formal or definite
7

seal a victory/win/match

to make a victory certain:
Smith's goal sealed the victory.

➔ somebody's lips are sealed

at lip (5)

; ➔ all signed and sealed

at sign2 (6)

seal something ↔ in

phrasal verb
to stop something that is inside something else from getting out:
Fry the meat quickly to seal in the juices.

seal something ↔ off

phrasal verb
to stop people from entering an area or building, because it is dangerous:
Following a bomb warning, police have sealed off the whole area.

Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.

Explore our topic dictionary