Definition of outrider noun from the Oxford Advanced American Dictionary

 

outrider

 noun
noun
NAmE//ˈaʊtˌraɪdər//
 
 
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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 the Oxford Advanced Learner's Dictionary entry: outrider