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

Word History

First Known Use

1892, in the meaning defined above

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