back a bill在票据的背面签字：
  Please back a bill.　请在票据的背面签字。
back a horse（在赛马等竞赛中）下赌注，赌马：
  Did you back a horse?　你下赌注了吗？
back and edge完全，总共；尽力，全力以赴：
　We will make it better back and edge.　我们将全力以赴地将它做地更好。
back and forth来来往往地，前后来回地，翻天覆地地：
  She rocked back and forth in the rocking chair.　她坐在摇椅里前前后地摇摆着。
　The discussed the problem back and forth, without getting very far.　他们翻天覆地地讨论这个问题，没有多大进展。
back away (from)（从••••••）后退，躲开：
  As the policeman arrived, the onlookers backed away.　警察赶到时，围观的人们都往后退。
back door后门，（喻）不正当关系：
  He sent his son into the famous college through the back door.　他通过后门把他儿子送一所名牌大学。
back down / off让步，退却；放弃（要求等）
  He would back down if we stood firm.　如果我们坚持立场，他会让步的。
　It’s too late to back down.　打退堂鼓已经来及了。　
back of在•••••的后面；是••••••的起因；作••••••的后盾：
He led the guests to the back of the stairs.　他把客人领到楼梯后面的大厅。
They were trying to find what were back of the incident.　他们正努力查清事件发生的原因。
They knew they were not fighting alone but had millions of people back of them.　他们知道他们不是在孤军奋战，而是亿万人民作他们的后盾。
back to back背靠背：
　　　They sat back to back alone the river.　他们背靠背坐在河边。
back to front前后倒置：
　　　　He put his coat on back to front. 他把上衣前后穿反了。
backwards and forwards忽来忽去，来来回回：
  Everyone in the street walked backwards and forwards and appeared to be constantly on the go.　街上的每个人来来回回地走着，显得问题很忙碌。
用法导航
该短语可用作backward and forward,　与back and forth同义。
bad egg坏蛋，混蛋，坏人：
  He is a bad egg.　他是个坏蛋。
bad luck倒霉，不幸：
  I had the bad luck to break my leg. 我不幸摔断了腿。
bad manners无礼貌，坏习惯：
  It’s had manners to smoke in public.　在公共场所抽烟是不礼貌的。
bad news to sb.　为（某人）不喜欢的人或事：
   The new captain of the football team was bad news to some fans.　一些球迷讨厌这位新的足球队长。
bad trip令人烦恼的经历，可怕的经历：
  --How was your math exam? –Don’t mention it, it was a bad trip.　你的数学考试如何？别提了，糟得很。
bag of bones骨瘦如柴的人或动物：
  During his illness he wasted away until he was just a bag of bones.　生病期间，他日渐消瘦，成了皮包骨头。
bags of 大量的；充足的：
   There is no hurry at all, as we still have bags of time to pack up.　别着急，我们还有足够的时间收拾行李。
bargain away廉价出售：
  I would bargain away the camera.　我要廉价出售这部照相机。
　Our hard – won rights should no be bargained away lightly.　我们不应当轻易放弃好不容易挣来的权利。
bargain money定金，预付款：
bargain price廉价品的价格：
bargain with和••••••讨价还价：
  My father tried to bargain with the owner of the shop.　我父亲试图和店主讨价还价。
base on / upon基于，以••••••为根据：
  His argument was based on facts.　他的论点以事实为根据。
　Don’t base our happiness on others’ suffering.　不要把自己的幸福建立在别的痛苦之上。
bathed in沉浸于，沐浴在：
  The mountain villages were bathed in the quiet moonlight.　山村沉浸在静静的月色中。
　Her face was bathed in tears.　她满面泪水。