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Definition of tailback noun from the Oxford Advanced Learner's Dictionary

tailback

noun
 
/ˈteɪlbæk/
 
/ˈteɪlbæk/
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  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.
    Topics Transport by car or lorryc2
  2. (also half back, half, North American English halfback)
    [countable, uncountable] one of the two attacking players in American football whose position is behind the quarterback and next to the full backs; the position a tailback plays at
See tailback in the Oxford Advanced American Dictionary

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