Chip on shoulder
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The phrase chip on one's shoulder means having a harboured grievance or sense of inferiority and being quick to take offence.
[edit] Origin
The saying originated during the nineteenth century in the United States, where people wanting a physical fight would carry a chip of wood on their shoulder, daring others to knock it off. Printed citations of this include the Long Island Telegraph, a New York newspaper, which on May 20th, 1830, printed "When two churlish boys were determined to fight, a chip would be places on the shoulder of one, and the other demanded to knock it off at his peril.".
A similar notion is mentioned in the issue of The Onondaga Standard of Syracuse, New York, on 8th December 1830: “‘He waylay me,’ said I, ‘the mean sneaking fellow — I am only afraid that he will sue me for damages. Oh! if I only could get him to knock a chip off my shoulder, and so get round the law, I would give him one of the soundest thrashings he ever had.’”
Some time later, in 1855, the phrase "chip on his shoulder" appeared in the Weekly Oregonian, stating "Leland, in his last issue, struts out with a chip on his shoulder, and dares Bush to knock it off.".
[edit] Derived meaning
Carrying a chip on one's shoulder was a form of challenge in the same spirit as a medieval knight throwing down his gauntlet. If an opponent picked up the glove, or knocked the chip of wood off their shoulder, the challenge was accepted and the fight was on.
Usage over time changed, now suggesting somebody who shows a belligerent attitude, acting as though they are asking for a fight. The chip is now figurative, but the idea remains the same.