Definitions of underground:
  • noun:   a secret group organized to overthrow a government or occupation force
  • noun:   electric underground railway
  • adjective:   conducted with or marked by hidden aims or methods
    Example: "Underground resistance"
  • adjective:   under the level of the ground
    Example: "Underground caverns"
  • adjective:   used of independent armed resistance forces
  • adverb:   beneath the surface of the earth
    Example: "Water flowing underground"
  • adverb:   in or into hiding or secret operation
    Example: "The organization was driven underground"

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Book See underground used in context: 861+ rhymes, several books and articles.

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