It is like being proud and having an attitude. You are just looking for trouble and want someone to challenge you so you can lay into them. Some people characteristically are hot-tempered and very easily become antagonistically angry -- then we say that they always carry a chip on their shoulder.
A person who has "a chip on his shoulder" is usually resentful but not necessarily angry because of something that happened or was imagined to have actually occurred in the past. Thus, a normally friendly, easygoing personality can suddenly turn sullen, sarcastic, abusive and antagonistic when a specific topic or point is mentioned in conversation. That's when we would use this idiomatic expression.
The mental image for this idiom is usually a man with an actual chip of wood on one shoulder, daring a conversation partner or perhaps anyone in a nearby crowd, to try to knock the chip off -- the signal or challenge to physically fight, in order to establish who is right, believing that "Might is Right".
a chip
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Chip off the old block means someone closely resembles their parents or mentors in some way, usually by appearance, mannerisms or skills/hobbies.
The plural of chip is chips.
shoulder season
You really have a chip on your shoulder. Don't get a chip on your shoulder over such a little thing.
She always walked around with a chip on her shoulder, ready to argue with anyone who crossed her path.
chip and dale
A "chip on his shoulder" is an idiom that refers to a person who is easily angered or feels they have been treated unfairly. It suggests that the person is carrying around a grudge or feeling defensive.
a chip
It might mean born with a chip on one's shoulder. Don't know the origin, but having a chip on your shoulder means that you have an antisocial attitude and are always looking for a fight with someone.
A poker chip. A wood chip. A computer chip. A cow chip. A chip off the old block. A chip on the shoulder.
The term "chip on your shoulder" is believed to have originated in the early 19th century in the United States. It refers to someone who is always ready to take offense or start a fight, as if they are carrying a metaphorical chip of wood on their shoulder, inviting others to knock it off and provoke a confrontation.
The cast of Chip on My Shoulder - 2009 includes: Jonathan Anastas as himself Ed Lalli as himself Chris Lauria as himself Steve Risteen as himself
Candy explains that Curley has a chip on his shoulder because he is a small man who is constantly trying to prove himself. He is insecure about his size and compensates by being aggressive and picking fights with bigger men.
They put it between my cats shoulder blades where she couldn't pick at it.
Someone may have a chip on their shoulder due to feeling slighted or disrespected in the past, leading to a persistent sense of being undervalued or overlooked. This can foster a defensive or combative attitude as a way of compensating for perceived injustices.