a chip on your shoulder
怨气，自卑感或敌意，常常准备对挑战或争执做出强烈反应
口语·形容易怒或记仇
英文释义
to have a grudge or to be easily angered or offended
例句
He's always got a chip on his shoulder about his background.
典故来源
源自19世纪美国，男孩放木屑在肩上挑衅别人打掉，以示好斗。