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Definitions of underground
  1. adjective
    conducted with or marked by hidden aims or methods
    "underground resistance"
  2. noun
    an electric railway operating below the surface of the ground (usually in a city)
    "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
  3. noun
    a secret group organized to overthrow a government or occupation force

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  4. adjective
    under the level of the ground
    "underground caverns"

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