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Verb: lighten  lI-t(u)n
  1. Make more cheerful
    "the conversation lightened me up a bit";
    - lighten up, buoy up
  2. Reduce the weight on; make lighter
    "she lightened the load on the tired donkey"
  3. Become more cheerful
    "after a glass of wine, he lightened up a bit";
    - lighten up, buoy up
  4. Make more cheerful through the use of colour
    "The paint will lighten the room";
    - brighten, lighten up
  5. Become lighter
    "The room lightened up";
    - lighten up
  6. Alleviate or remove (pressure or stress) or make less oppressive
    "lighten the burden of caring for her elderly parents";
    - relieve

Derived forms: lightening, lightens, lightened

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

Antonym: darken, weigh down