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Definition of Light up
1. Verb. Start to burn with a bright flame. "The coal in the BBQ grill finally lit up"
2. Verb. Make lighter or brighter. "This lamp lightens the room a bit"
Exact synonyms: Illume, Illuminate, Illumine, Light
Generic synonyms: Lighten, Lighten Up
Specialized synonyms: Floodlight, Spotlight
Derivative terms: Illuminant, Illumination, Illumination, Light, Light, Light, Light, Light, Light
Generic synonyms: Lighten, Lighten Up
Specialized synonyms: Floodlight, Spotlight
Derivative terms: Illuminant, Illumination, Illumination, Light, Light, Light, Light, Light, Light
3. Verb. Become clear. "The sky cleared after the storm"
4. Verb. Ignite. "The sky lit up quickly above the raging volcano"
5. Verb. Begin to smoke. "After the meal, some of the diners lit up"