Definition of river runner in US English:

river runner

noun

North American
  • 1A boat used to travel by river.

  • 2A person who navigates a fast-flowing river in a small craft (as a raft, rubber dinghy, canoe, etc.), now especially as a leisure activity.

Origin

Late 19th century (in an earlier sense). From river + runner.

Pronunciation

river runner

/ˈrɪvə ˌrʌnə/