"person or animal that hops," mid-13c., agent noun from hop (v.). From c. 1200 as a surname, and perhaps existing in Old English (which had hoppestre "female dancer").
"container with a narrow opening at the bottom," late 13c., probably an agent noun from hop (v.1) via the notion of the grain juggling in a mill hopper or the mechanism itself, which was set to operate with a shaking motion. Railroad hopper-car is from 1862.
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