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English definition of “underground”

underground

noun (PEOPLE)    /ˈʌn.də.ɡraʊnd/ US  /-dɚ-/
[U] people in a society who are trying new and often shocking or illegal ways of living or forms of art: In Britain and the USA in the 1970s, the underground was a powerful subversive force.Nomadic and alternative lifestyles the underground a group of people who secretly fight against the government: He was a member of the underground, harassing the invading army.Taking action against people in powerActivism and pressure groups
(Definition of underground noun (PEOPLE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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