n. A box, usually with grating or bars on one side or more, in which poultry are confined for fattening, transportation, exhibition, etc., or in which a hen with young chicks is shut for shelter and to keep her from straying.n. A pen; an inclosed place for small animals, poultry, etc.n. Any narrow, confining place of abode, as a house or room.n. A cask; a barrel, keg, tub, pail, or other vessel formed of staves and hoops, for containing liquids.n. A Dutch corn-measure equal to about one tenth of a Winchester peck.n. A tumbrel or close cart.To put into a coop; confine in a coop; cage; hence, to shut up or confine in a narrow compass: often followed by up: as, the poor of the city are cooped up in crowded tenements.To make or repair (a vessel formed of staves and hoops); hoop (a vessel).Synonyms To inclose, imprison, hem in, cage.