underground

Noun
  1. A secret group organized to overthrow a government or occupation force (synset 108377599)
    is a type of: revolutionary group - a political unit organized to promote revolution
    subtypes: maquis - the French underground that fought against the German occupation in World War II
    same as: resistance
  2. An electric railway operating below the surface of the ground (usually in a city) (synset 103762667)
    "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
    is a type of: railroad, railroad line, railway, railway line, railway system - line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight
    same as: metro, subway, subway system, tube
Adverb
  1. In or into hiding or secret operation (synset 400489216)
    "the organization was driven underground"
  2. Beneath the surface of the earth (synset 400489115)
    "water flowing underground"
Adjective
  1. Under the level of the ground (synset 302481459)
    "belowground storage areas"; "underground caverns"
    similar to: subsurface - beneath the surface
    same as: belowground
  2. Conducted with or marked by hidden aims or methods (synset 301710918)
    "clandestine intelligence operations"; "cloak-and-dagger activities behind enemy lines"; "hole-and-corner intrigue"; "secret missions"; "a secret agent"; "secret sales of arms"; "surreptitious mobilization of troops"; "an undercover investigation"; "underground resistance"
    similar to: covert - secret or hidden; not openly practiced or engaged in or shown or avowed
    same as: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover

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