Coop up refers to confining someone or something to a small or restricted space. It's an idiom that can be used to express feelings of isolation, confinement, or constraint. Antonyms for coop up include release, set free, let loose, allow to roam, open up, and free range. These words signify freedom, liberation, and expansion. They are the opposite of coop up, and they indicate the act of giving someone or something more space, more autonomy, or more opportunities to explore. In everyday language, antonyms for coop up can be used in a variety of contexts, including parenting, animal welfare, urban planning, and social justice.