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tailback

noun [C]
 
/ˈteɪl.bæk/ mainly UK

Definition

a line of vehicles that have stopped or are moving only very slowly, because of an accident or other problem on the road in front of them: Yesterday there was a four-mile tailback on the main road into the city after a crash.Traffic jams
(Definition of tailback noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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