/ Thesaurus / E Synonyms of expansion bolt Find synonyms for: Noun1. expansion bolt, boltusage: a bolt that has an attachment that expands as the bolt is driven into a surfaceWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language