Synonyms of 'cover-up'
He denied there'd been any cover-up of the fraud.
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Complicity is involvement with other people in an illegal activity or plan.
evidence of their complicity with international terrorists
The concealment of information or a feeling involves keeping it secret.
His concealment of his true motives was masterly.
Thesaurus for cover-up from the Collins English Thesaurus
If you cover something or someone up , you put something over them in order to protect or hide them.