/ Thesaurus / S Synonyms of speak up Find synonyms for: Verb1. opine, speak up, speak out, animadvert, sound off, declareusage: express one's opinion openly and without fear or hesitation; "John spoke up at the meeting"2. speak up, talk, speak, utter, mouth, verbalize, verbaliseusage: speak louder; raise one's voice; "The audience asked the lecturer to please speak up"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language