To Bleach

1. (transitive) To treat with bleach, especially so as to whiten (fabric, paper, etc.) or lighten (hair).
2. (intransitive) To be whitened or lightened (by the sun, for example).
3. (intransitive, biology, of corals) to lose color due to stress-induced expulsion of symbiotic unicellular algae.
4. (transitive, figuratively) To make meaningless; to divest of meaning; to make empty.

blanch