Definition of post-runner in US English:

post-runner

noun

  • In early use: †a person travelling express, on foot or horseback, with messages, letters, etc.; a courier, messenger (obsolete). Later: a person who carries the post or mail on foot along a particular route.

Origin

Late 16th century; earliest use found in James Dalrymple (fl. c1596). From post + runner, originally after to run (also ride) the post.

Pronunciation

post-runner

/ˈpəʊs(t)ˌrʌnə/