biker /ˈbaɪkə/

• 1. 

  N-COUNT Bikers are people who ride around on motorcycles, usually in groups. 骑摩托车的人 (尤指团体)

  例：

  There are always fights going on between rival bikers.

  在敌对的摩托车手之间总是发生着冲突。

• 2. 

  N-COUNT People who ride bicycles are called bikers. 骑自行车的人 [美国英语]