break one's back [breik wʌnz bæk]

以下由轻松背单词网站提供

尽最大努力；拼命干

I'm not going to break my back working for such low wages.我才不愿为这么低的工资而拼命做活。
She broke her back to take care of her son.她非常辛苦地照顾自己的孩子。