A horse-drawn wagon capable of travelling quickly.
Origin
Late 17th century; earliest use found in William Penn (1644–1718), Quaker leader and founder of Pennsylvania. From post + wagon; in specific use for a mail coach in the Netherlands and Germany, after Dutch postwagen, German Postwagen.
Definition of post-wagon in US English:
post-wagon
nounˈpəʊs(t)ˌwaɡ(ə)n
historical
A horse-drawn wagon capable of travelling quickly.
Origin
Late 17th century; earliest use found in William Penn (1644–1718), Quaker leader and founder of Pennsylvania. From post + wagon; in specific use for a mail coach in the Netherlands and Germany, after Dutch postwagen, German Postwagen.