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English definition of “tailback”

tailback

noun [C] uk   /ˈteɪl.bæk/ mainly UK us  
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.
(Definition of tailback from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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