chip on one's shoulder

chip on one's shoulder idiom
A belligerent attitude or grievance, as in Mary is easily offended; she always has a chip on her shoulder. This term actually was defined in a newspaper article (Long Island Telegraph, May 20, 1830): “When two churlish boys were determined to fight, a chip would be placed on the shoulder of one and the other demanded to knock it off at his peril.” [Early 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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