动词短语
back away
定义后退（To move backwards; to retreat）
例句As she saw the snake, she backed away very slowly.
back down定义让步（To take a less aggressive position in a conflict than one previously has or has planned to.）
例句Alice wanted to sue her annoying neighbor, but I convinced her to back down.
back off定义后退（To retreat）.
例句The security guard told the protester to back off.
back out
定义倒车（To reverse a vehicle from a confined space）.
例句He backed his Mercedes out of the garage.
bag out定义批评（To criticise someone）.
例句He bagged her out because she was late for the meeting.
bail out定义.
1.保释通过提供保释金以使被捕的人获释
2. 舀水把船里的水舀出来
3.拯救，尤指在财政上拯救
4. 在飞行中离开飞机;跳伞从飞机上跳伞;弹射出来。
1.He called his wife to bail him out.2. They bailed out the boat as it was leaking.3. The government had to bail out the industrial sector because of recession.4. The pilot bailed out of his fighter and parachuted onto a forest.
ball up定义1. To crush into a ball shape.（压成球状）2. To confuse; bungle.（困惑;失败）
Example(s)1. Leila balled up her paper in anger.2. All the hardship that she has experienced had completely balled her up.
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