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Definition of underground noun from the Oxford Advanced Learner's Dictionary

underground

noun
 
/ˈʌndəɡraʊnd/
 
/ˈʌndərɡraʊnd/
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  1. (often the Underground)
    (British English)
    (North American English subway)
    [singular] an underground railway system in a city
    • underground stations
    • the London Underground
    • I always travel by underground.
    see also London Underground
    British/American underground / subway / metro / tubeunderground / subway / metro / tube
    • A city’s underground railway system is usually called the underground (often the Underground) in British English and the subway in North American English. Speakers of British English also use subway for systems in American cities and metro for systems in other European countries. The Metro is the name for the systems in Paris and Washington, D.C. London’s system is often called the Tube.
    compare metro, tube
    Extra Examples
    • I always seem to get lost in the underground.
    • I often travel on the underground.
    • It brought the whole underground system to a halt.
    Topics Transport by bus and traina2
    Oxford Collocations Dictionaryverb + underground
    • go by
    • go on
    • take
    underground + noun
    • station
    • train
    • tunnel
    preposition
    • in the underground
    • on the underground
    See full entry
  2. the underground
    [singular + singular or plural verb] a secret political organization, usually working against the government of a country
    • The underground was/were determined to resist.
    Topics War and conflictc2
  3. (Indian English) a person who works against the government as a member of a secret political organization
See underground in the Oxford Advanced American Dictionary
previously
adverb
 
 
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