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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 more cheerful through the use of colour
    "The paint will lighten up the room";
    - brighten, lighten
  4. Become lighter
    "The room lightened up";
    - lighten

Derived forms: lightening up, lightened up, lightens up

Type of: alter, buck up [informal], change, cheer, cheer up, jolly [informal], modify