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back up
phrasal verb with back uk/bæk/ us/bæk/ verb

If traffic backs up, the vehicles have to wait in a long line because there are too many of them.堵(车)

The traffic is starting to back up on the M25.25号高速公路开始堵车了。

See also: back sb up


See also: back sth up

back up phrasal verb
confirm2

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