out·rid·er
noun/ˈaʊtraɪdə(r)/
/ˈaʊtraɪdər/
- a person who rides a motorcycle or a horse in front of or next to the vehicle of an important person in order to give protection
（要人座车周围的）骑士护卫，摩托护卫 - The President’s car was escorted by motorcycle outriders.
总统的座驾由摩托车护送员护送。
- The President’s car was escorted by motorcycle outriders.