A temporary, quickly constructed fortification, usually breast-high. See Synonyms at bulwark.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "breastwork" in a sentence
"Hidden behind the breastwork was a body of troops from Beauséjour."
"These stones are much larger than our own, are angular, and of a size that works very well into a wall; and the materials being plenty, a breastwork, that is proof against everything but artillery, is soon formed by a crowd."
"So we immediately tied our horses to bushes near and put up our saddles as a kind of breastwork but before they reached us, they turned off into some timber on a stream, built a kind of fort of logs, bushes, their saddles and blankets, as a shade if we attacked them, and took their horses into the fort with them."