1. to make or become brighter in light or color
2. to make or become more cheerful or hopeful

Examples

• The sun began to brighten the morning sky.
• She used a lamp to brighten the dark corner.
• His face brightened when he saw his friends.
• The good news brightened everyone’s mood.
• The flowers will brighten up the room.
• Her smile brightened the whole day.
• The paint will brighten these dull walls.