Breadcrumb Home > Dictionary > Index E expansion bolt: Meaning and Definition of Find definitions for: expan'sion bolt" Pronunciation: [key] — Building Trades. Building Trades. a bolt inserted into a hole drilled in masonry and mechanically expanded to serve as an anchor for shelves, timbers, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. expansion bit expansion card TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: inimical Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language