bend over backwards竭盡全力。這個習語原本是指身體往後彎的動作，也就是下腰。因為下腰對許多人來說都是需要很努力才能做到的事，所以便用來表示「非常努力或竭盡心力」，特別是用在幫助、滿足或取悅他人的時候。
看看老外聊天時怎麼用bend over backwards:
Julia: I heard that your brother got the scholarship. Congratulations!
Kent: Thanks. My mom has been bending over backwards to support him.
Julia: He has been working very hard at school. He deserves it.
Kent: Well, he always tries his best not to let my mom down.
Julia: I wish my brother could be as thoughtful as yours.
朱莉婭：聽說你弟弟拿到獎學金了，恭喜！
肯特：謝謝你，我媽一直都竭盡全力地在支持他。
朱莉婭：他在學業上一直都很認真，這是他應得的。
肯特：嗯，他總是盡力不讓我媽失望。
朱莉婭：真希望我弟弟也可以像他一樣善解人意。
bend over backwards例句精選：
I bend over backwards for them, and they can't even help keep our house clean.
為了他們，我可以付出一切，可是他們連為我保持房屋清潔這種小事都做不到。
They'll bend over backwards to help you.
他們會盡全力來幫助你的。
I want you to bend over backwards to this customer, it's a very important account.
你要想盡一切辦法拉住這個客戶，這可是個重要大戶頭。
We bend over backwards to keep young people out of prison.
我們千方百計使年輕人免致犯罪入獄。
拓展學習：
attempt 努力；嘗試
endeavor 盡力
hassle 困難
hesitate 猶豫
go out of the way 煞費苦心
break one's back 拼命工作
lie down on 偷懶