COOP Meaning of COOP in English ■ noun1》 a cage or pen for confining poultry. 2》 Brit. a basket used in catching fish. ■ verb (usu. be ~ed up ) confine in a small space.OriginME cowpe , based on L. cupa ; cf. ~er . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004