UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈaʊtraɪdər/US:USA pronunciation: respellingUSA pronunciation: respelling(outrī′dər)

WordReference Random House Unabridged Dictionary of American English © 2020
out•rid•er  (outrī′dər),USA pronunciation n. 
  1. a mounted attendant riding before or beside a carriage.
  2. (at a racetrack) a mounted rider who accompanies or leads a racehorse to the post.
  3. a person who goes in advance of an automobile or person to clear a passage.
  4. a person who leads the way or is a member of a vanguard;
  5. a person who rides out or forth, esp. a scout, cowhand, ranch hand, or the like.
  • 1300–50; Middle English: official in a monastery; see out-, rider

Collins Concise English Dictionary © HarperCollins Publishers::
outrider /ˈaʊtˌraɪdə/ n
  1. a person who goes in advance to investigate, discover a way, etc; scout
  2. a person who rides in front of or beside a carriage, esp as an attendant or guard
  3. US a mounted herdsman
'outrider' also found in these entries (note: many are not synonyms or translations):
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