Synonyms of 'whiten'
His face whitened as he heard the news.
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If you blanch, you suddenly become very pale.
She felt herself blanch at the unpleasant memories.
If the sun bleaches something, or something bleaches, its colour gets paler until it is almost white.
The sun will cause the hairs on your face to bleach.
Thesaurus for whiten from the Collins English Thesaurus
When something whitens or when you whiten it, it becomes whiter or paler in colour.