1. Make more cheerful through the use of colour
   "The paint will brighten the room";
   - lighten up, lighten
    
2. Become free from clouds or less cloudy; become brighter
   "The sky brightened after the storm";
   - clear up, clear, light up

Sounds like: Brighton

Derived forms: brightens, brightening, brightened

Type of: alter, change, modify, vary

Antonym: darken

Encyclopedia: Brighten