Wiktionary
round file
n. (context humorous English) the trash; the wastebasket
WordNet
round file
n. a file with a circular cross section; used to file the inside of holes
Wikipedia
Round file
Round file may refer to:
- A tool, a type of file, used to cut fine amounts of material from a work piece and also known as a rat-tail file
- Slang for a waste container
Usage examples of "round file".
Qwilleran had learned never to crumple discarded paper if he expected it to stay in the round file for more than three minutes.