courier (n.)

c. 1300, corour, "a swift horse;" mid-14c., "a messenger sent with letters or despatches," from Anglo-French courrier, from Old French coreor "fast-running horse; messenger, scout," ultimately an agent noun from Latin currere "to run" (from PIE root *kers- "to run"). From 1770 as "travelling servant who makes arrangements at hotels and on a journey for his employer."

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