Definition of underground

Definition of underground
  1. underground Adjective Below the ground; below the surface of the Earth.
  2. underground Adjective Hidden, furtive, secretive.
  3. underground Adjective Of music, art, etc, outside the mainstream.
  4. underground Adverb Below the ground.
  5. underground Adverb Secretly.
  6. underground Noun An underground railway.
  7. underground Noun A movement or organisation of people who resist political convention.
  8. underground Noun A movement or organisation of people who resist artistic convention.
  9. underground Verb To route electricity distribution cables underground
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