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coop (n.)

"small cage for poultry," mid-14c., coupe, from Old English cype, cypa "large wicker basket, cask," akin to Middle Dutch kupe, Swedish kupa, and all probably from Latin cupa "tub, cask," from PIE *keup- "hollow mound" (see cup (n.)).

coop (v.)

"put into a coop, confine in a narrow compass" (usually with up), 1560s, from coop (n.). Related: Cooped; cooping.