Definition of accordion file
: 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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First Known Use of accordion file
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