let the cat out of the bag

• Révéler un secret ou divulguer une information confidentielle, généralement par inadvertance ou imprudence.

To reveal a secret or disclose confidential information, usually unintentionally or carelessly.

1. B2informal

   To accidentally or carelessly reveal a secret or confidential information.

   vendre la mèche

   • She let the cat out of the bag about the surprise party.
   • He accidentally let the cat out of the bag when he mentioned the promotion.
   • Don't let the cat out of the bag about our vacation plans.