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Meaning of “underground” - Learner’s Dictionary

underground

adjective, adverb     /ˈʌndəɡraʊnd/
UNDER SURFACE
B2 under the surface of the ground: underground caves an animal that lives undergroundGeology - general words
POLITICAL ACTIVITY
Underground political activities are secret and illegal: an underground political organizationSecrecy and privacyTaking action against people in power
(Definition of underground adjective, adverb from the Cambridge Learner’s Dictionary © Cambridge University Press)
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