back up definition, meaning - what is back up in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “back up”

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back up

phrasal verb with back uk   us   /bæk/ verb
If traffic backs up, the vehicles have to wait in a long line 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 Learners Dictionary & Thesaurus © Cambridge University Press)
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