whiten
Whiten (verb) means to make something white or whiter, or to become that way, often by bleaching.
Etymology
Comes from Middle English whitenen, whitnen, from Old Norse hvítna (“to whiten”), from Proto-Germanic *hwītnōną (“to whiten, become white”), from Proto-Indo-European *kwind-, *kwint- (“bright”); it is equivalent to white and -en. It is cognate with Icelandic hvítna (“to whiten”), Swedish vitna, hvitna (“to whiten”), and Danish hvidne (“to whiten”). Compare Old English hwītian (“to whiten, become white, be white, make white”).