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Meaning & Definition of Underground in English

English

Underground

/əndərgraʊnd/

noun

1. A secret group organized to overthrow a government or occupation force

synonym:
  • underground,
  • resistance

2. 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'"
synonym:
  • metro,
  • tube,
  • underground,
  • subway system,
  • subway

adjective

1. Under the level of the ground

  • "Belowground storage areas"
  • "Underground caverns"
synonym:
  • belowground,
  • underground

2. 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"
synonym:
  • clandestine,
  • cloak-and-dagger,
  • hole-and-corner(a),
  • hugger-mugger,
  • hush-hush,
  • secret,
  • surreptitious,
  • undercover,
  • underground

adverb

1. In or into hiding or secret operation

  • "The organization was driven underground"
synonym:
  • underground

2. Beneath the surface of the earth

  • "Water flowing underground"
synonym:
  • underground

Examples of using

Seek shelter in a fortified, windowless room, preferably underground.
Tom has gone underground.
Tom has gone underground.