UNDERGROUND

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

(adjective) 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”

belowground, underground

(adjective) under the level of the ground; “belowground storage areas”; “underground caverns”

underground

(adverb) beneath the surface of the earth; “water flowing underground”

underground

(adverb) in or into hiding or secret operation; “the organization was driven underground”

metro, tube, underground, subway system, subway

(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’”

underground, resistance

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

Source: WordNet® 3.1

Etymology

Adjective

underground (comparative more underground, superlative most underground)

(not comparable) Below the ground; below the surface of the Earth.

Synonyms: subterranean, hypogean

(figurative) Hidden, furtive, secretive.

Synonyms: Thesaurus:hidden, Thesaurus:covert

(Of music, art) Outside the mainstream, especially unofficial and hidden from the authorities.

Synonyms: unconventional, alternative

Antonym: mainstream

Adverb

underground (comparative more underground, superlative most underground)

Below the ground.

Synonym: below ground

Secretly.

Synonyms: clandestinely, in secret, on the quiet

Noun

underground (plural undergrounds)

(geography) Regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).

(chiefly, British) synonym of subway: a railway that is under the ground.

(with definite article) A movement or organisation of people who resist political convention.

Synonym: resistance

(with definite article) A movement or organisation of people who resist artistic convention.

Synonyms: avant-garde, counterculture

Verb

underground (third-person singular simple present undergrounds, present participle undergrounding, simple past and past participle undergrounded)

To route electricity distribution cables underground

Proper noun

Underground

(UK, rail transport) The London Underground.

Synonym: Tube

Source: Wiktionary

Un"der*ground`, n.

Definition: The place or space beneath the surface of the ground; subterranean space. A spirit raised from depth of underground. Shak.

Un"der*ground`, a.

1. Being below the surface of the ground; as, an underground story or apartment.

2. Done or occurring out of sight; secret. [Colloq.] Underground railroad or railway. See under Railroad.

Un"der*ground`, adv.

Definition: Beneath the surface of the earth.

Source: Webster’s Unabridged Dictionary 1913 Edition

UNDERGROUND

Etymology

Adjective

Adverb

Noun

Verb

Proper noun

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