Bleaching means making something white or lighter in color, usually using a chemical or the sun.
Bleaching can make things look clean and bright. It's often used for clothes or hair.
Examples:
She is bleaching her hair.
The sun is bleaching the old paper.
We are bleaching the white shirts.
The bleach is bleaching the towel too much!
The sun is bleaching the sand so much, it looks like snow.
He is bleaching his socks to make them super white.