What is chip on your shoulder meaning?

The phrase "chip on your shoulder" is used to describe someone who is easily offended or prone to holding a grudge or feeling resentful. It can also refer to someone who is constantly looking for a fight or a reason to be angry or defensive. The origin of the phrase is not entirely clear, but it is believed to come from the practice of placing a literal chip of wood on one's shoulder as a challenge for someone to knock it off, thus provoking a fight. Having a chip on your shoulder can impede relationships and create unnecessary conflict, so it's important to work on letting go of any feelings of resentment or defensiveness.