1. to become brighter or more luminous
Usage: intransitive
2. to make something brighter or more luminous
Usage: transitive
3. to become more cheerful or hopeful
Usage: intransitive

Examples

• The sky brightens as the sun rises.
• She brightens the room with colorful decorations.
• His face brightens when he sees his friends.
• Good news always brightens my day.
• The lamp brightens the dark corner.
• Her smile brightens whenever she talks about her hobby.
• Fresh paint brightens the old walls.