Breadcrumb Home > Thesaurus > C Synonyms of coo Find synonyms for: Noun1. coo, cryusage: the sound made by a pigeonVerb1. coo, murmurusage: speak softly or lovingly; "The mother who held her baby was cooing softly"2. coo, utter, emit, let out, let looseusage: cry softly, as of pigeonsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of coo (Dictionary) ✖ Related Content Daily Word Quiz: triumphalism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language