outrider
noun [ C ] uk/ˈaʊtˌraɪ.dər/ us/ˈaʊtˌraɪ.dɚ/
摩托车侍从；（尤指为官方车辆开道的）摩托车警卫
a person, especially a police officer, who rides on a motorcycle next to or in front of an official vehicle
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