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back up
phrasal verb
present tense
I/you/we/theyback up
he/she/itbacks up
present participlebacking up
past tensebacked up
past participlebacked up
  1. 1
    [T] [back someone up] to give support to someone by telling other people that you agree with them 支持(某人)

    If I ask for more money will you back me up? 如果我要更多的钱,你会支持我吗?

     Synonyms and related words
  2. 2
    [T] to show that an explanation or belief is probably true 证实(解释或信仰)

    All the evidence backs up her story. 所有证据都证实了她所说的情况。

     Synonyms and related words
  3. 3
    [I/T] to make a copy of information on your computer (在计算机上)复制,备份,把…备份
     Synonyms and related words
  4. 4
    [I/T] if traffic backs up, or if it is backed up, the vehicles are in a long line and waiting to continue moving (使)交通堵塞

    Traffic is backing up on all out-of-town routes. 所有出城的道路都出现了交通堵塞。

    Cars were backed up for miles. 汽车堵塞了数英里。

     Synonyms and related words
    1. a.
      if a toilet, sink, or drain backs up, or if it is backed up, water cannot flow through it because something is blocking it (使)(坐便器、水槽或水管)堵塞
       Synonyms and related words
    2. b.
      if a system backs up, or if it is backed up, it has slowed down or stopped working because there is too much of something for it to deal with (使)积压

      Orders are really backed up this month. 这个月订单确实积压了很多。

  5. 5
    [I] to move backwards a short distance 后退

    I need everyone to back up about 10 paces. 我需要每个人后退大约10步。

     Synonyms and related words
  6. 6
    [I/T] to make a car go backwards 倒(车)

    See if you can back up a bit further. 看看你能否把车再倒一点。

    back something up something :

    I'll back the car up the driveway. 我要把车倒到车道上。

  7. 7
    [I] mainly American used for telling someone to return to something that was said earlier 倒回去说

    Back up: didn't you say they had already met? 倒回去说,你不是说过他们已经会面了吗?

See also main entry: back
back up phrasal verb
confirm2

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