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Definitions and Synonyms of underground | Another word for underground | What is underground?

Definition 1: an electric railway operating below the surface of the ground (usually in a city) - [noun denoting artifact]

Samples where underground or its synonyms are used according to this definition

  • in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'

Synonyms for underground in the sense of this definition

(underground is a kind of ...) line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight

Definition 2: a secret group organized to overthrow a government or occupation force - [noun denoting group]

Synonyms for underground in the sense of this definition

(underground is a kind of ...) a political unit organized to promote revolution

(... is a kind of underground ) the French underground that fought against the German occupation in World War II

Definition 3: beneath the surface of the earth - [adverb denoting all]

Samples where underground or its synonyms are used according to this definition

  • water flowing underground

Definition 4: in or into hiding or secret operation - [adverb denoting all]

Samples where underground or its synonyms are used according to this definition

  • the organization was driven underground

Definition 5: conducted with or marked by hidden aims or methods - [adjective satellite denoting all]

Samples where underground or its synonyms are used according to this definition

  • 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 for underground in the sense of this definition

(underground is similar to ...) secret or hidden; not openly practiced or engaged in or shown or avowed

"covert actions by the CIA" "covert funding for the rebels"

Definition 6: under the level of the ground - [adjective satellite denoting all]

Samples where underground or its synonyms are used according to this definition

  • belowground storage areas
  • underground caverns

Synonyms for underground in the sense of this definition

(underground is similar to ...) beneath the surface

"subsurface materials of the moon"

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