To solarise means to make something become like the sun or to expose something to the sun's light.
Solarising can make things bright and warm. It can also mean making something more like the sun.
Examples:
The flowers are solarising in the sun.
She is solarising the water by putting it in the sun.
The sun is solarising the whole garden.
The cat is solarising itself in the warm sun.
He is solarising the room with a big lamp.
Solarising the world with light is a big job.