Definition of mourning coach in US English:

mourning coach

noun

  • 1A coach of black colour used by a person during the whole period of his or her mourning (now historical).

  • 2A closed carriage, usually black, used to convey mourners on the occasion of a funeral.

Origin

Mid 17th century; earliest use found in James Shirley (bap. 1596, d. 1666), playwright and poet.