/ Thesaurus / P Synonyms of plump for Find synonyms for: Verb1. back, endorse, indorse, plump for, plunk for, support, approve, O.K., okay, sanctionusage: be behind; approve of; "He plumped for the Labor Party"; "I backed Kennedy in 1960"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language