verb (v)

• make lighter or brighter(verb.change)

  Example:
  The paint will brighten the room.
  

  Synonym:
  illume, illuminate, illumine, light, light up, lighten, lighten up
  Antonym:
  darken
  

  source: wordnet30
• become clear(verb.weather)

  Synonym:
  clear, clear up, light up
  Antonym:
  cloud, overcast
  

  source: wordnet30
• To make bright or brighter; to make to shine; to increase the luster of; to give a brighter hue to.(verb)

  source: webster1913
• To grow bright, or more bright; to become less dark or gloomy; to clear up; to become bright or cheerful.(verb)

  source: webster1913