/ Thesaurus / K Synonyms of knock back Find synonyms for: Verb1. set back, knock back, put back, cost, beusage: cost a certain amount; "My daughter's wedding set me back $20,000"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: didactic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language