Insult 的意思是侮辱，injury 的意思是受伤。To add insult to injury 的字面意思是“受伤了还被侮辱“，实际含义是“雪上加霜、在伤口上撒盐“。人们常用它来表示气愤的心情。
My brother said my clothes were shabby, and then to add insult to injury, he suggested that I should lose some weight.
They told me I was too old for the role, and then to add insult to injury, they asked me to pay for their expenses!
First of all, Jake was one hour late for dinner, then adding insult to injury, he started to complain about my choice of restaurant.
好了，我们今天要学习的短语是To add insult to injury。