lid

Short definition from Wiktionary

Noun

1. 1
   The top or cover of a container.
2. 2
   A cap or hat.
3. 3
   One ounce of cannabis.
4. 4
   A bodyboard or bodyboarder.
5. 5
   An operculum or other lid-like cover.
6. 6
   A motorcyclist's crash helmet.
7. 7
   In amateur radio, an incompetent operator.
8. 8
   Clipping of eyelid.
9. 9
   A hermetically sealed top piece on a microchip such as the integrated heat spreader on a CPU.
10. 10
    A restraint or control, as when "putting a lid" on something.
11. 11
    A kid (from the rhyming slang bin lid).

Verb

1. 1
   To put a lid on (something).