back up

名词 back up:

1. an accumulation caused by clogging or a stoppage
   同义词：backup
2. someone who takes the place of another (as when things get dangerous or difficult)
   同义词：stand-in, substitute, relief, reliever, backup, backup man, fill-in
3. a subordinate musical part; provides background for more important parts
   同义词：accompaniment, musical accompaniment, backup, support
4. (computer science) a copy of a file or directory on a separate storage device
   同义词：backup, computer backup
5. the act of providing approval and support
   同义词：backing, backup, championship, patronage

动词 back up:

1. give moral or psychological support, aid, or courage to
   同义词：support
2. move backwards from a certain position
   同义词：back off, back down
3. establish as valid or genuine
   同义词：back
4. make a copy of (a computer file) especially for storage in another place as a security copy
5. become or cause to become obstructed
   同义词：clog, choke off, clog up, congest, choke, foul

1. His condescending attitude really gets my back up.
   他那种居高临下的恩赐态度实在使我很生气。
2. He drought along a file of document to back up his claim.
   他随身携带一卷宗文件以便证实索赔要求。
3. As the1979 deadline came nearer, some states which at first had backed up the Equal Right Amendment changed their mind and voted against it.
   1979年这个期限临近了，最初支持平等权利修正案的一些州后来改变了主意，投票反对这个法案。
4. The bus had to back up and turn around.
   汽车得往后退，再倒过来。