lighten up

Verb
  1. Make more cheerful (synset 201818041)
    "the conversation lightened me up a bit"
  2. Become more cheerful (synset 200861800)
    "after a glass of wine, he lightened up a bit"
  3. Make more cheerful through the use of color (synset 200313597)
    "The paint will brighten the room"
  4. Become lighter (synset 200281690)
    "The room lightened up"

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