Oxford Dictionary English

    tailback

    noun
    noun
    BrE BrE//ˈteɪlbæk//
    ; NAmE NAmE//ˈteɪlbæk//
    Motoring problems and accidents
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  1. 1[countable] (British English) a long line of traffic that is moving slowly or not moving at all, because something is blocking the road It took a couple of hours for the two-mile tailback to clear. There are five-mile tailbacks on the M25 this morning. There are reports of severe tailbacks in both directions. Wordfindertrafficclamp, cone, contraflow, pedestrian, roadworks, speed hump, tailback, toll, traffic, zebra crossing See related entries: Motoring problems and accidents
  2. 2[countable, uncountable] = half back
See tailback in the Oxford Advanced American Dictionary
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