underground railway

/AH1 N D ER0 G R AW0 N D R EY1 L W EY0/
noun
  1. 1

    (rail transport) Synonym of subway: a railway under the ground.

  2. 2

    Alternative form of Underground Railroad. [(historical) The pre-American Civil War anti-slavery resistance movement dedicated to helping escaped slaves to reach safe territory.]

  3. 3

    (usually capitalized) Alternative form of Underground Railroad. [(historical) The pre-American Civil War anti-slavery resistance movement dedicated to helping escaped slaves to reach safe territory.]