Used as a verb it means to bleach the hair and remove current color.
When used as a noun it refers to the chemical composition designed to remove color from the hair. Bleach is sometimes referred to as a pre-lightening or decolorizing treatment.
Daily Hair Tip
For a low maintenance style, try to work with your natural hair type rather than against it. For example, if your hair is naturally wavy, select a hairstyle that works easily with the waves.