Definition of tail back in English:

tail back

British (Of traffic) become congested and form a tailback: traffic tailed back fourteen miles after a chemical spillage
More example sentences
  • The accident closed one lane of the westbound carriageway, which led to inevitable delays with traffic tailing back to junction two of the M27.
  • The smash caused traffic chaos on a busy Saturday afternoon, with shoppers travelling to the nearby Lakeside shopping centre facing long delays with traffic tailing back along the M25 to the A127 junction.
  • Cameras showed that during the day traffic was tailing back to the A35 Redbridge flyover and several hundred metres along the M271.
become congested, form a tailback, jam
See parent entry: tail

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walk or travel at a leisurely pace