bend over backwards什么意思解释？

bend over backwards的音标：...

Bottom line bend over backwards to avoid confusing your customer.一定要谨守最重要的原则:要用尽一切方法避免混淆顾客.We bend over backwards to keep young people out of prison.我们千方百计使年轻人免致犯罪入狱.Sue will bend over backwards to help her friends.苏会尽全力...