Whiten
Whiten , intransitive verb
[Old English whitenen; compare Icelandic hvītna.]
To grow white; to turn or become white or whiter; as, the hair whitens with age; the sea whitens with foam; the trees in spring whiten with blossoms.
Whiten , transitive verb
To make white; to bleach; to blanch; to whitewash; as, to whiten a wall; to whiten cloth.
The broad stream of the Foyle then whitened by vast flocks of wild swans.