/ Thesaurus / B Synonyms of belly out Find synonyms for: Verb1. belly, belly out, swell, swell up, intumesce, tumefy, tumesceusage: swell out or bulge outWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: devout Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language