Attache

google

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early 19th century: from French, literally ‘attached’, past participle of attacher .

etymonline

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attache (n.)

1835, from French attaché "junior officer attached to the staff of an ambassador, etc.," literally "attached," noun use of past participle of attacher "to attach" (see attach). Attache case "small leather case for carrying papers" first recorded 1900.