lid

• lid
• 1

  cover

  [countable] a cover for the open part of a pot, box, or other container
• dustbin/saucepan etc lid
• the name on the coffin lid
• lid of
• He carefully lifted the lid of the box.
• 2

  eye

  [countable] an eyelid
• 3

  keep a/the lid on something

   to control a situation very carefully, especially so that it does not cause problems:
• keeping the lid on inflation
• Kline keeps a very tight lid on his private life.
• 4

  put a/the lid on something

  informal to do something that finally stops something or ruins or ends someone's plans or hopes:
• Let's put a lid on all these rumours.
• 5

  take the lid off something

  also lift the lid on something to let people know the true facts about a bad or shocking situation:
• a documentary that takes the lid off the world of organized crime

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.