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

underground

adjective
 
 
/ˌʌndəˈɡraʊnd/
 
/ˌʌndərˈɡraʊnd/
[only before noun]
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  1.  
     under the surface of the ground
    • an underground bunker/tunnel
    • underground parking
    • an underground car park
    • underground passages/caves/streams
    • underground cables
    • They carried out a series of underground nuclear tests.
    compare overground
  2. operating secretly and often illegally, especially against a government
    • an underground resistance movement
    • The changes will affect all workers, whether underground or legal.
    • The party was originally formed as an underground organization in 1987.
    Topics War and conflictc2, Crime and punishmentc2
See underground in the Oxford Advanced American DictionarySee underground in the Oxford Learner's Dictionary of Academic English
Check pronunciation: underground

Nearby words

trait
noun
 
 
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