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

underground

adverb
 
/ˌʌndəˈɡraʊnd/
 
/ˌʌndərˈɡraʊnd/
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  1. under the surface of the ground
    • Rescuers found victims trapped several feet underground.
    • animals that live underground
    • toxic waste buried deep underground
    • a network of pipelines running underground
  2. in or into a secret place in order to hide from the police, the government, etc.
    • He went underground to avoid arrest.
    • If the group is outlawed they will go underground.
    • Opposition groups have been driven underground.
    Topics War and conflictc2
See underground in the Oxford Advanced American Dictionary
buttercup
noun
 
 
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