accordion file
noun
variants
or accordion folder
: a folder that is used for the organization and storage of documents and files and that has pleated sides which allow expansion of the folder
… he is riffling through his ever-present accordion file of documents, speeches, articles …—John Colapinto, Rolling Stone, 13 Sept. 2001
Organize your financial records. Buy an accordion folder and store your important papers …—Dave Burge, El Paso Times (Texas), 5 Dec. 2005
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