| underground | (n) a secret group organized to overthrow a government or occupation force, Syn. resistance |
| underground | (adv) in or into hiding or secret operation, Example: the organization was driven underground |
| underground | (adv) beneath the surface of the earth, Example: water flowing underground |
| underground railroad | (n) secret aid to escaping slaves that was provided by abolitionists in the years before the American Civil War, Syn. Underground Railway |
| Underground | n. A spirit raised from depth of underground. Shak. [ 1913 Webster ] |
| Underground | a.
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| Underground | adv. Beneath the surface of the earth. [ 1913 Webster ] |
| Underground insurance | . Wildcat insurance. [ Webster 1913 Suppl. ] |
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