light up

definition: make lighter or brighter
example:
speech part: verb
synonyms: light
definition: begin to smoke
example:
speech part: verb
synonyms: light
definition: start to burn with a bright flame
example:
speech part: verb
synonyms:
definition: ignite
example:
speech part: verb
synonyms:
definition: become clear
example:
speech part: verb
synonyms: clear

How light up is being used?