/ Thesaurus / S Synonyms of strengthening Find synonyms for: Noun1. strengthening, transformation, transmutation, shiftusage: becoming stronger2. strengthening, increase, step-upusage: the act of increasing the strength of somethingVerb1. strengthen, beef up, fortify, change, alter, modifyusage: make strong or stronger; "This exercise will strengthen your upper body"; "strengthen the relations between the two countries"2. strengthen, changeusage: gain strength; "His body strengthened"3. 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: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language