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Definition of 'lighten up'

Verb

  1. make more cheerful; "the conversation lightened me up a bit"
       Synonyms: lighten buoy up
       Antonyms: weigh down weigh on
  2. become more cheerful; "after a glass of wine, he lightened up a bit"
       Synonyms: lighten buoy up
  3. make lighter or brighter; "The paint will brighten the room"
       Synonyms: brighten lighten
       Antonyms: darken
  4. become lighter; "The room lightened up"
       Synonyms: lighten


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