Question

(to) have a chip on one's shoulder Ever since Mike was told he had to leave his office and move into a cubicle, he's had a chip on his shoulder.origin: This expression comes from the 19th century. Those looking for a fight placed a chip on their shoulder. If an opponent knocked it off, the fight was on. Although that custom has ended, we still say an angry person has a chip on his or her shoulder.

Accepted Answer

to remain angry about a past insult; to bear a grudge

Idiom	(to) have a chip on one's shoulder
Meaning	to remain angry about a past insult; to bear a grudge
Example	Ever since Mike was told he had to leave his office and move into a cubicle, he's had a chip on his shoulder. origin: This expression comes from the 19th century. Those looking for a fight placed a chip on their shoulder. If an opponent knocked it off, the fight was on. Although that custom has ended, we still say an angry person has a chip on his or her shoulder.

Chip Shoulder Angry Fight One's Remain Past Insult