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Verb: lighten up
  1. Make more cheerful
    - lighten, buoy up
     
  2. Become more cheerful
    "after a glass of wine, he lightened up a bit";
    - lighten, buoy up
     
  3. Make lighter or brighter
    "The paint will lighten up the room";
    - brighten, lighten
     
  4. Become lighter
    "The room lightened up";
    - lighten

Derived forms: lightened up, lightening up, lightens up

Type of: alter, change, cheer, cheer up, chirk up, modify