(uncountable) A chemical, such as sodium hypochlorite or hydrogen peroxide, or a preparation of such a chemical, used for disinfecting or whitening.

(countable) A variety of bleach.

An act of bleaching; exposure to the sun.

(transitive) To treat with bleach, especially so as to whiten (fabric, paper, etc.) or lighten (hair).

(intransitive) To be whitened or lightened (by the sun, for example).

(intransitive, biology, of corals) To lose color due to stress-induced expulsion of symbiotic unicellular algae.

(transitive, figurative) To make meaningless; to divest of meaning; to make empty.