Verb light up has 5 senses
  1. light up - start to burn with a bright flame; "The coal in the BBQ grill finally lit up"
    --1 is one way to
    erupt, ignite, catch fire, take fire, combust, conflagrate
    Sample sentence:
    Something ----s
  2. light, illume, illumine, light up, illuminate - make lighter or brighter; "This lamp lightens the room a bit"
    --2 is one way to lighten, lighten up
    Sample sentences:
    Somebody ----s something
    Something ----s something
  3. clear up, clear, light up, brighten - become clear; "The sky cleared after the storm"
    Sample sentences:
    Something ----s
    It is ----ing
  4. light up - ignite; "The sky lit up quickly above the raging volcano"
    --4 is one way to
    ignite, light
    Sample sentence:
    Something ----s
  5. light up, fire up, light - begin to smoke; "After the meal, some of the diners lit up"
    --5 is one way to ignite, light
    Sample sentence:
    Somebody ----s
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