give light to; throw light on
ornament (buildings, streets, etc.) with lights for a special occasion
make clear
"This lamp lightens the room a bit"
"Could you clarify these remarks?"
"Clear up the question of who is at fault"
Striking a match, he illuminated the melancholy place.
出自: Conan Doyle
Philip produced an electric flashlight..to illuminate their way.
出自: J. C. Powys
The Waterloo victory, for which Dublin illuminated herself.
出自: E. Bowen
For an instant a look of pure delight illuminated that lean, sombre face.
出自: fig.