- seal
- 1
noun (C)
1 ANIMAL a large sea animal that eats fish and lives around coasts or on floating pieces of ice2 OFFICIAL MARK a mark that has a special design and shows the legal or official authority of a person or organization: a black book stamped with the Presidential Seal3 ON CONTAINERS/PIPESa) a piece of rubber or plastic that keeps air, water, dirt etc out of something: Do not use this product if the inner seal is broken.b) a piece of wax 1 (1), paper, wire etc that you have to break in order to open something4 seal of approval if you give something your seal of approval, you say that you approve of it, especially officially: All we need now is the chairman's seal of approval.5 set the seal on to make something definite or complete: A last-minute goal set the seal on Tottenham's victory.6 seal of friendship/success/victory etc something that makes your friendship stronger, your success more certain etc2 verb1 also seal up (T) to close an entrance or a container with something that stops air, water etc from coming in or out of it: The windows have been sealed up for years.2 (T) to close an envelope, pack etc by using something sticky to hold its edges in place: Don't seal the envelope yet.3 my lips are sealed spoken used to say that you are not going to tell someone something4 seal sb's fate to make something, especially something bad, sure to happen: He was about to say the words that would seal my fate for ever.5 seal a friendship/promise/agreement etc to do something that makes a friendship, promise etc more formal or definiteseal sth in phrasal verb (T) to stop what something contains from getting out: Fry the meat quickly to seal in the flavor. seal sth off phrasal verb (T) to stop people entering an area or building, because it is dangerous: Following a bomb warning, police have sealed off the whole area.
Longman dictionary of contemporary English. 2004.