WordReference Random House Learner's Dictionary of American English © 2020
at•taˈché ˌcase, n. [countable]
  • a flat, usually stiff briefcase for carrying business papers, documents, etc.

  • WordReference Random House Unabridged Dictionary of American English © 2020
    attaché case′, 
  • a flat, usually rigid, rectangular briefcase for carrying business papers, documents, or the like. Also called  dispatch case. 
    • 1900–05

    Collins Concise English Dictionary © HarperCollins Publishers::
    attaché case n
    1. a small flat rectangular briefcase used for carrying documents, papers, etc
    'attaché case' also found in these entries:
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