noun
a method of painting walls or buildings with whitewash
verb
to cover up or gloss over the faults or errors of (someone or something)
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The practice of whitewashing historical events has been criticized for distorting the truth.
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I can't believe they're whitewashing the story to make themselves look better.
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Stop whitewashing the situation and tell me the truth.
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She tried to whitewash her past mistakes, but everyone could see the truth.