dirty laundry

noun2

1. •
   Unflattering or embarrassing facts, or questionable activities that one wants to remain secret, but which someone else may use as blackmail.

   • If you don't tell me why you did it, I'll air all your dirty laundry to your boss.
2. •
   A clothes hamper or other container in which soiled laundry is placed.

   • Place your dirty clothes in the dirty laundry.