This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One who rides the near horse of the leaders to guide the horses drawing a coach.

n. A rider mounted on the near, leading horse pulling a carriage who guides the team.

n. One who rides and guides the first pair of horses of a coach or post chaise; also, one who rides one of the horses when one pair only is used.

n. A post-boy; one who rides a post-horse; a guide or forerunner.

n. One who rides the near horse of the leaders when four or more horses are used in a carriage or post-chaise, or who rides the near horse when one pair only is used and there is no driver on the box.

n. Same as postilion-basque.

n. someone who rides the near horse of a pair in order to guide the horses pulling a carriage (especially a carriage without a coachman)

"The postilion was a venerable 'boy' of sixty -- a martyr to rheumatic gout, the result of excessive exposure in youth, counteracted by strong liquors -- who had stood at inn-doors doing nothing for the whole five-and-twenty years that had elapsed since he had no longer been required to ride professionally, as if expecting the old times to come back again."

horseman    horseback rider    equestrian   

postillion   

postillion    coachman    beerhouse    hostler    wine-shop