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The definition of underground
6 Definitions of: underground
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- adjective, adverb, occurring, situated, used, or going below ground level
- adjective, adverb, secret; hidden
- noun, a space or region below ground level
- noun, a) a movement dedicated to overthrowing a government or occupation forces, as in the European countries occupied by the German army in World War II b) (as modifier)
- noun, an electric passenger railway operated in underground tunnels. US and Canadian equivalent: subway
- noun, a) any avant-garde, experimental, or subversive movement in popular art, films, music, etc b) (as modifier)
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| Synonyms: | surreptitious, secret, subterranean, basement, sunken, cove, bury, undercover, covert, hidden | And more... |
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From Collins
©HarperCollins 2008. Collins English Dictionary definition of underground