Question

a sentence after writing the meanings (e) light up

Answer 1

HEYYA ...
HOPE MY ANSWER WILL HELP U IN ANY WAY..^_^..
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the term LIGHT UP refers to ;- 
THE JOY OR HAPPINESS A PERSON HAVE , FROM HIS/HER INNER SOUL.

EXAMPLE;-
Parents eyes got light up ..by know their child's awesome results...
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have a great day ^_^

Answer 2

light up=joy/happiness from our core of heart.

We are lighted up by seeing the waterfalls.

Hope this helps you quickly