Break Your Back
定义
If you break your back to do something, you work very hard to do it.
如果你break your back to do某事，意思是你非常努力地工作。
例句
I am not going to break my back to this job for such a low salary.
Burn Candles At Both Ends
定义
If you burn candles at both ends, you work very hard, day and night.
如果你燃烧蜡烛在两端，你就日夜努力工作。
例句
She has been burning candles at both ends to finish a book about the history of the United States of America.
Burn The Midnight Oil
定义
Work hard, especially late into the night.
工作很努力，尤其是到深夜。
例句
She was burning the midnight oil preparing for her daughter's wedding when she had a heart attack.
Cold Piece Of Work
定义
If someone is a cold piece of work they are difficult to deal with.
如果某人是a cold piece of work，意思是很难相处。
例句：
Did you see how she treats her husband? She is a cold piece of work.
Devil Finds Work For Idle Hands To Do
定义
当人们不做任何有用的事情时，他们倾向于做无聊或有害的事情来摆脱他们的无聊。
例句：
My husband made sure that the children are always occupied doing something because you know the devil finds work for idle hands to do.
dirty Work
定义
(also do the dirty work) unpleasant work or dishonest action.
(也有do the dirty work)不愉快的工作或不诚实的行为。
例句：
1. I don't know but I feel there is some dirty work going on in this company.
2. I always have to do the dirty work. I never have fun.
