DICT.TW Dictionary Taiwan

 out·rid·er /-ˌraɪdɚ/
 騎馬侍從;侍衛;先驅者

 Out·rid·er n.
 1. A summoner whose office is to cite men before the sheriff. [Obs.]
 2. One who rides out on horseback, beyond the main group, e. g., as a scout.
 3. A servant on horseback attending a carriage.
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 outrider
      n : an escort who rides ahead (as a member of the vanguard)