outrider

noun

1. （要人座车周围的）骑士护卫，摩托护卫
   a person who rides a motorcycle or a horse in front of or beside the vehicle of an important person in order to give protection

1. N-COUNT （为官方车辆开道的）摩托车警卫，骑士护卫
   Outriders are people such as policemen who ride on motorcycles or horses beside or in front of an official vehicle, in order to protect the people in the vehicle.
   1. ...a black Mercedes with motorcycle outriders provided by the city's police.
      由该市警方的摩托护卫为其开道的黑色梅赛德斯车

noun

1. an escort who rides ahead (as a member of the vanguard)