| 1. |
(adverb) beneath the surface of the earth; "water flowing underground" |
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| 2. |
(adverb) in or into hiding or secret operation; "the organization was driven underground" |
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| 3. |
(noun) a secret group organized to overthrow a government or occupation force |
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Synonyms: resistance |
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Related Words: Maquis, revolutionary group |
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| 4. |
(satellite adjective) under the level of the ground; "belowground storage areas"; "underground caverns" |
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Synonyms: belowground |
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| 5. |
(satellite adjective) used of independent armed resistance forces; "guerrilla warfare"; "partisan forces" |
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Synonyms: guerilla, guerrilla, irregular |
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| 6. |
(noun) an electric underground railway |
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Synonyms: metro, subway, tube |
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Related Words: railroad, railroad line, railway, railway line, railway system |
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| 7. |
(satellite adjective) conducted with or marked by hidden aims or methods; "clandestine intelligence operations"; "cloak-and-dagger activities behind enemy lines"; "hole-and-corner intrigue"; "secret missions"; "a secret agent"; "secret sales of arms"; "surreptitious mobilization of troops"; "an undercover investigation"; "underground resistance" |
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Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, on the quiet, secret, surreptitious, undercover |
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