0 a person, especially a police officer, who rides on a motorcycle next to or in front of an official vehicle
Disciplinary action was taken in that instance with alacrity as an outrider reported the matter very promptly indeed.
You are in character enough of a man to play the part of an outrider throughout the world.
After several hours of embarrassment, he had to be given a motor cycle outrider escort to get him there in reasonable time.
One sees motor cycle outriders, presumably gendarmerie, weaving in and out around traffic bollards and so on.
Maybe as they get bigger their movements should be reported and recorded; and perhaps when they reach one million tons they may need to have an outrider escort.
As an outrider pony, he escorted horses in the post parade and led them to the gate.
An attendant on horseback called an "outrider" often rode ahead of or next to a carriage.
Outrider towers, supported on pillars, housed additional instruments slightly further from the building, giving them a wider angle of view.