That letter went straight into the circular file.Most of the junk mail sits here until I can put it into the circular file.
circular file
noun a wastebasket US, 1947
circular file
A jocular term for a trashcan or waste basket, i.e., a receptacle for unwanted files. You have to make your application really stand out if you don't want it to end up in the employer's circular file.
circular file
and round file
n. a wastebasket. (see also file thirteen.) Most of the junk mail sits here until I can put it into the circular file. Oh, that letter? It went straight to the round file.