the light of somebody’s life
US /ðə laɪt əv ˈsʌmˌbɑdiz laɪf/
UK /ðə laɪt əv ˈsʌmˌbɑdiz laɪf/

1.
la lumière de la vie de quelqu'un
a person who is extremely important to someone and makes them feel happy and complete
:
•
His granddaughter is the light of his life.
Sa petite-fille est la lumière de sa vie.
•
After they adopted the child, she became the light of their life.
Après avoir adopté l'enfant, elle est devenue la lumière de leur vie.