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Verb: light up
  1. Start to burn with a bright flame
    "The coal in the BBQ grill finally lit up"
  2. Introduce light into
    - light, illume, illumine, illuminate
  3. Become free from clouds or less cloudy; become brighter
    "The sky lit up after the storm";
    - clear up, clear, brighten
  4. Ignite
    "The sky lit up quickly above the raging volcano"
  5. Begin to smoke
    "After the meal, some of the diners lit up";
    - fire up, light

Derived forms: lighting up, lit up, lights up

Type of: catch fire, combust, conflagrate, erupt, ignite, light, lighten, lighten up, take fire