Definition of outrider noun from the Oxford Advanced Learner's Dictionary

 

outrider

 noun
noun
BrE BrE//ˈaʊtraɪdə(r)//
 
; NAmE NAmE//ˈaʊtraɪdər//
 
People in motoring, Equine sports
 
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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 The President’s car was escorted by motorcycle outriders. See related entries: People in motoring, Equine sports
See the Oxford Advanced American Dictionary entry: outrider