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Adjective: underground  ,ún-du(r)'grawnd
  1. Under the level of the ground
    "underground caverns";
    - belowground
     
  2. Conducted with or marked by hidden aims or methods
    "underground resistance";
    - clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover
     
  3. (of music, art, etc.) not mainstream; radically new
    "The band gained a following in the underground music scene"
Noun: underground  ,ún-du(r)'grawnd
  1. [Brit] An electric railway operating below the surface of the ground (usually in a city)
    "We took the underground to avoid traffic congestion";
    - metro, tube [UK], subway system [N. Amer], subway [N. Amer]
     
  2. A secret group organized to overthrow a government or occupation force
    "The French underground played a crucial role during World War II";
    - resistance
Adverb: underground  ,ún-du(r)'grawnd
  1. Beneath the surface of the earth
    "water flowing underground"
     
  2. In or into hiding or secret operation
    "the organization was driven underground"

Derived forms: undergrounds

See also: covert, subsurface

Type of: rail, railroad [N. Amer], railroad line [N. Amer], railway [Brit, Cdn], railway line [Brit, Cdn], railway system [Brit, Cdn], revolutionary group

Encyclopedia: Underground