「落井下石」英文怎么说？

add insult to injury 

落井下石、更糟糕的是……、雪上加霜

They told me I was too old for the job, and then to add insult to injury, they refused to pay my expenses. 

他们说我太老了，干不了这份工作，更雪上加霜的是，他们还拒绝支付我各种的开销。

The bank took back my car and then added insult to injury by cancelling my credit cards. 

银行收回了我的车子，更糟糕的是，还取消了我的信用卡。

The intro 

(Fill in the blanks)

Hey ! What's up, peeps ? It's Mr.Wong here. Do you guys know anyone that likes to run their mouth, just trash talking all the time. I hope you guys dont have that kind of friend because some are just rude and inconsiderate. They find pleasure in insulting people and love to add insult to injury, making your day even worse than ever. Well...I've got something to say to those kind of people : Son of a _____（5 letters）! Mother ______(6 letters). I'm just kidding ! If we insult them then we're no different from them. We're better than that. So, instead of telling them to ____(4 letters) off, we can politely tell them to go away or just ignore them. Okay, so today's new phrase is "add insult to injury". Check it out !

没看懂？请自己查字典！

（这才是真正的学习过程）