/ Thesaurus / T Synonyms of tone up Find synonyms for: Verb1. tone, tone up, strengthen, exercise, work outusage: give a healthy elasticity to; "Let's tone our muscles"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language