Definition of outward-bounder in US English:

outward-bounder

noun

informal
  • 1An outward-bound vessel. Now historical.

  • 2Frequently in form Outward Bounder. A person attending an Outward Bound school, course, etc., or advocating the methods of such schools; (in extended use) a person enjoying or practised in outdoor pursuits.

Origin

Mid 19th century; earliest use found in Herman Melville (1819–1891), novelist and poet. From outward-bound + -er.

Pronunciation

outward-bounder

/ˌaʊtwədˈbaʊndə/