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underground

English

  1. 🔊 under the level of the ground
    “belowground storage areas”
  2. 🔊 a secret group organized to overthrow a government or occupation force
  3. 🔊 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'”
  4. 🔊 beneath the surface of the earth
    “water flowing underground”
  5. 🔊 in or into hiding or secret operation
    “the organization was driven underground”

Similar words

metro tube subway system subway resistance clandestine cloak-and-dagger hole-and-corner(a) hugger-mugger hush-hush secret surreptitious undercover belowground amtrak charley l trojan horse vc vietcong abstruse agreement to disagree alienated alienation