whitewash
US /ˈwaɪt.wɑːʃ/
UK /ˈwaɪt.wɑːʃ/

1.
2.
a deliberate concealment of an unpleasant or incriminating fact.
:
•
The report was criticized as a whitewash of the scandal.
•
Many believed the investigation was a complete whitewash.
1.
2.
to attempt to conceal unpleasant or incriminating facts about (someone or something).
:
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The government tried to whitewash the corruption scandal.
•
They accused the company of trying to whitewash its environmental record.