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. a black Mercedes with motorcycle outriders provided by the city's police. a guard or police officer who rides on a motorcycle or horse beside or in front of a vehicle in which an important person is travelling
{i} one who rides forth, ranch hand; escort, one who rides out before an automobile to clear the way; rider on horseback who leads or accompanies a carriage