/ Thesaurus / C Synonyms of coop in Find synonyms for: Verb1. coop up, coop in, confineusage: confine in or as if in a coop; "she coops herself up in the library all day"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: quandary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language