lighten up

Verb

• become lighter
  • The room lightened up
    

• make lighter or brighter
  • The paint will brighten the room
    

• become more cheerful
  • after a glass of wine, he lightened up a bit
    

• make more cheerful
  • the conversation lightened me up a bit
    

Related words

• Synonyms: 
  lighten , brighten , buoy up
• Antonyms: 
  darken , weigh down , weigh on