To harbor resentment, feel defensive, or have a confrontational attitude, often due to feeling unfairly treated.
This phrase originated in 19th-century America, where placing a wood chip on one's shoulder and daring others to knock it off was a way to provoke a fight. The practice was documented as early as the 1830s and became a metaphor for someone walking around with a combative attitude, ready to take offense.
The physical origin of this phrase reveals something profound about human psychology - we literally carry our emotional baggage in our posture and body language. Modern research shows that people who feel marginalized or discriminated against often do develop a hypervigilant stance, making this 19th-century metaphor remarkably prescient about trauma responses.
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