tailback /ˈteɪlˌbæk/ (tailbacks)

• 1.  

  N-COUNT（可数名词） A tailback is a long line of traffic stretching back along a road, which moves very slowly or not at all, for example, because of roadworks or an accident. (拥堵造成的) 汽车长龙 [英国英语]

  例：

  There was a seven-mile tailback on the motorway.

  在高速公路上有7英里的汽车长龙。

• 2.  

  N-COUNT（可数名词） In American football, a tailback is the player furthest from the front line. The tailback often runs with the ball. (美式足球) 攻方尾后位 [美国英语]