N-COUNT [usually n NOUN](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. (为官方车辆开道的)摩托车警卫,骑士护卫
...a black Mercedes with motorcycle outriders provided by the city's police.