brighten

verb:to become more luminous or to increase in light intensity
- The sky began to brighten as the sun rose over the horizon.
verb:to improve someone's mood or make a situation more positive
- His unexpected compliment brightened her spirits after a long day.
verb:to make something lighter or brighter in color
- She decided to brighten the room with a coat of yellow paint.
verb:to become more cheerful or lively
- His face seemed to brighten when he heard the good news.