UNDERGROUND

• (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'"

  synonyms : metro , subway , subway system , tube

• (noun) a secret group organized to overthrow a government or occupation force

  synonyms : resistance

• (adverb) beneath the surface of the earth

  "water flowing underground"

• (adverb) in or into hiding or secret operation

  "the organization was driven underground"

• (adj.) conducted with or marked by hidden aims or methods

  "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"

  synonyms : clandestine , cloak-and-dagger , hole-and-corner , hugger-mugger , hush-hush , secret , surreptitious , undercover

  They were on a clandestine mission. -added by naila_inlas

  
  -tagged by editor1
  guy in black T-Shirt is an undercover agent.

• (adj.) under the level of the ground

  "belowground storage areas", "underground caverns"

  synonyms : belowground

WordNet® 3.0, © 2006 by Princeton University.

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