have a chip on your shoulder 敏感，生气，耿耿于怀（因觉得受委屈或不如别人优秀而）

【例句】
He's got a chip on his shoulder about not having been to university.
他因没能上大学而耿耿于怀。

Fred has such a chip on his shoulder—you never know what's going to set him off next.
弗莱德对此耿耿于怀，你从不知什么会使他生气。