back up Meaning in the Cambridge English Dictionary
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Meaning of “back up” in the English Dictionary

"back up" in British English

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back up

phrasal verb with back uk   us   /bæk/ verb
If ​trafficbacks up, the ​vehicles have to ​wait in a ​longline because there are too many of them: The ​traffic is ​starting to back up on the M25.
(Definition of back up from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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