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src: wikipedia
- Definition
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- light up :start to burn with a bright flame
- The coal in the BBQ grill finally lit up
- light up :make lighter or brighter
- This lamp lightens the room a bit
- light up :become clear
- The sky cleared after the storm
- light up :ignite
- The sky lit up quickly above the raging volcano
- light up :begin to smoke
- After the meal, some of the diners lit up