Breadcrumb Home > Thesaurus > K Synonyms of knuckle Find synonyms for: Noun 1. knuckle, knuckle joint, metacarpophalangeal joint, synovial joint, articulatio synovialis, diarthrosis usage: a joint of a finger when the fist is closed Verb 1. knuckle, press usage: press or rub with the knuckles 2. knuckle, shoot usage: shoot a marble while keeping one's knuckles on the ground WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of knuckle (Dictionary) ✖ Related Content Daily Word Quiz: umbrage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language