The phrase "rejection pile" refers to a collection of things that have been turned down or not accepted. It usually refers to a pile of documents, such as job applications or manuscripts, that have been rejected by someone.
Sentences with «rejection pile»
Checking for resume - ruining mistakes can help you avoid the automatic rejection pile. (resume-now.com)
The First Five Pages: A Writer's Guide to Staying Out of the Rejection Pile, by Noah Lukeman. (editorialdepartment.com)
As soon as an agent hits a «red flag» the query letter goes into the rejection pile. (literary-agents.com)