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Definition of Lighten up
1. Verb. Make more cheerful. "The conversation lightened me up a bit"
2. Verb. Become more cheerful. "After a glass of wine, he lightened up a bit"
3. Verb. Make lighter or brighter. "The paint will brighten the room"
4. Verb. Become lighter. "The room lightened up"
Exact synonyms: Lighten
Generic synonyms: Change
Specialized synonyms: Irradiate, Illume, Illuminate, Illumine, Light, Light Up
Antonyms: Darken
Generic synonyms: Change
Specialized synonyms: Irradiate, Illume, Illuminate, Illumine, Light, Light Up
Antonyms: Darken