'Underground' definitions:
Definition of 'underground'
From: WordNet
adverb
In or into hiding or secret operation; "the organization was driven underground"
adverb
Beneath the surface of the earth; "water flowing underground"
adjective
Under the level of the ground; "belowground storage areas"; "underground caverns" [syn: belowground, 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" [syn: clandestine, cloak-and-dagger, hole-and-corner(a), hugger-mugger, hush-hush, secret, surreptitious, undercover, underground]
noun
A secret group organized to overthrow a government or occupation force [syn: underground, resistance]
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'" [syn: metro, tube, underground, subway system, subway]
Definition of 'Underground'
From: GCIDE
- Underground \Un"der*ground`\, n.
- 1. The place or space beneath the surface of the ground; subterranean space. [1913 Webster]
- A spirit raised from depth of underground. --Shak. [1913 Webster]
- 2. a subway or subway system, especially in the United Kingdom. [chiefly British] [PJC]
- 3. a secret organization opposed to the prevailing government; as, the French underground during the Nazi occupation. [PJC]
- 4. a group or movement holding unorthodox views in an environment where conventional ideas dominate, as in artistic circles. [PJC]
Definition of 'Underground'
From: GCIDE
- Underground \Un"der*ground`\, a.
- 1. Being below the surface of the ground; as, an underground story or apartment. [1913 Webster]
- 2. Done or occurring out of sight; secret. [Colloq.] [1913 Webster]
- Underground railroad or Underground railway. See under Railroad. [1913 Webster]
Definition of 'Underground'
From: GCIDE
- Underground \Un"der*ground`\, adv. Beneath the surface of the earth. [1913 Webster]
Definition of 'underground'
From: GCIDE
- Subway \Sub"way`\, n.
- 1. An underground way or gallery; especially, a passage under a street, in which water mains, gas mains, telegraph wires, etc., are conducted. [1913 Webster]
- 2. An underground railroad, usually having trains powered by electricity provided by an electric line running through the underground tunnel. It is usually confined to the center portion of cities; -- called also tube, and in Britain, underground. In certain other countries (as in France or Russia) it is called the metro. [PJC]
Synonyms of 'underground'
From: Moby Thesaurus
- abstruse,
- agreement to disagree,
- alienated,
- alienation,
- alternative,
- Amtrak,
- antiestablishment,
- apostasy,
- at odds with,
- at rest,
- at variance with,
- avant-garde,
- back door,
- back stairs,
- back way,
- back-door,
- backstairs,
- baggage train,
- beclouded,
- behind the curtain,
- behind the scenes,
- behind the veil,
- blind,
- bolt-hole,
- branch,
- breakaway,
- buried,
- bushfighter,
- bushwhacker,
- cable railroad,
- cable railway,
- casual,
- Charley,
- choo-choo,
- clandestine,
- close,
- clouded,
- cog railroad,
- cog railway,
- collaborationist,
- collaborator,
- concealed,
- counter-culture,
- covered,
- covert,
- covert way,
- covertly,
- crypto,
- deep-buried,
- difference,
- differing,
- disaccord,
- disagreeing,
- disagreement,
- disapprobation,
- disapproval,
- disparity,
- dissatisfaction,
- dissension,
- dissent,
- dissentience,
- dissentient,
- dissenting,
- dissidence,
- dissident,
- diversity,
- dropping out,
- eclipsed,
- el,
- electric,
- electric railway,
- electric train,
- elevated,
- elevated railway,
- embankment,
- escalier derobe,
- escape hatch,
- escape route,
- experimental,
- express,
- express train,
- extremists,
- feeder,
- feeder line,
- feline,
- fellow traveler,
- fifth column,
- fifth columnist,
- flier,
- fraternizer,
- freight,
- freight train,
- freighter,
- funicular,
- furtive,
- goods train,
- gravity-operated railway,
- guerillas,
- guerrilla,
- hid,
- hidden,
- hidlings,
- hole-and-corner,
- horse railway,
- hugger-mugger,
- in a cloud,
- in a corner,
- in a fog,
- in a whisper,
- in darkness,
- in eclipse,
- in hidlings,
- in opposition,
- in purdah,
- in secret,
- in the background,
- in the dark,
- in the wings,
- incommunicado,
- insurgents,
- insurrectionists,
- interurban,
- irregular,
- junction,
- L,
- latent,
- light railroad,
- lightning express,
- limited,
- line,
- local,
- main line,
- maquis,
- maquisard,
- metro,
- milk train,
- minority opinion,
- monorail,
- mysterious,
- nobody the wiser,
- nonagreement,
- nonassent,
- nonconcurrence,
- nonconforming,
- nonconformist,
- nonconformity,
- nonconsent,
- obfuscated,
- obscure,
- obscured,
- occult,
- opposing,
- opposition,
- parliamentary,
- parliamentary train,
- partisan,
- passenger train,
- private,
- privy,
- quiet,
- rack railway,
- rack-and-pinion railroad,
- rack-and-pinion railway,
- radical,
- rail,
- rail line,
- railroad,
- railroad train,
- railway,
- rattler,
- recondite,
- recusance,
- recusancy,
- recusant,
- rejection,
- repudiation,
- resistance,
- resistance fighter,
- resting in peace,
- revolutionary,
- roadbed,
- roadway,
- rolling stock,
- saboteur,
- secession,
- secluded,
- secluse,
- secret,
- secret exit,
- secret passage,
- secret staircase,
- secretly,
- sectarian,
- sectary,
- security risk,
- sequestered,
- shifty,
- shuttle,
- shuttle train,
- side door,
- sidetrack,
- siding,
- skulking,
- slinking,
- slinky,
- sly,
- sneaking,
- sneaky,
- sotto voce,
- special,
- stealthy,
- streamliner,
- street railway,
- streetcar line,
- sub rosa,
- subterranean,
- subterraneous,
- subversive,
- subversives,
- subway,
- sunken,
- surreptitious,
- switchback,
- terminal,
- terminus,
- track,
- train,
- tram,
- tramline,
- trestle,
- Trojan horse,
- trolley line,
- trunk,
- trunk line,
- tube,
- turnout,
- under an eclipse,
- under cover,
- under house arrest,
- under the breath,
- under the rose,
- under wraps,
- under-the-counter,
- under-the-table,
- undercover,
- underfoot,
- underground fighter,
- underground railroad,
- underground route,
- underhand,
- underhanded,
- unknown,
- unobtrusive,
- variance,
- VC,
- Vietcong,
- way train,
- with bated breath,
- withdrawal,
- wrapped in clouds