cover your tracks
US /ˈkʌvər jʊər træks/
UK /ˈkʌvər jʊər træks/

1.
masquer ses traces, effacer les preuves
to hide or conceal evidence of one's actions, especially wrongdoing
:
•
After stealing the documents, he tried to cover his tracks by deleting all emails.
Après avoir volé les documents, il a essayé de masquer ses traces en supprimant tous les e-mails.
•
The politician was careful to cover his tracks regarding the scandal.
Le politicien a pris soin de masquer ses traces concernant le scandale.