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English definition of “backed up”

backed up

adjective [after verb]     /ˌbæktˈʌp/
If traffic is backed up, the vehicles have to wait in a long line because there are too many of them: The traffic is backed up for six miles on the road to the coast .
(Definition of backed up adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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