Webster's English Dictionary

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coop

1. coop \'ku:p, 'ku.p\ n [ME cupe; akin to OE cy-pe basket, cot cot] 1: a 
   cage or small enclosure (as for poultry); also : a small build ing for 
   housing poultry 2a: a confined area  2b: JAIL 
2. coop vt 1: to confine in a restricted often crowded area  2: to place or 
   keep in a coop : PEN