n. | 1. | The place or space beneath the surface of the ground; subterranean space. | |||
2. | a subway or subway system, especially in the United Kingdom. | ||||
3. | a secret organization opposed to the prevailing government; | ||||
4. | a group or movement holding unorthodox views in an environment where conventional ideas dominate, as in artistic circles. | ||||
a. | 1. | Being below the surface of the ground; | |||
2. | Done or occurring out of sight; secret.
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adv. | 1. | Beneath the surface of the earth. |
Noun | 1. | underground - a secret group organized to overthrow a government or occupation force Synonyms: resistance |
2. | ![]() | |
Adj. | 1. | underground - under the level of the ground; "belowground storage areas"; "underground caverns" Synonyms: belowground |
2. | underground - 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" | |
3. | underground - used of independent armed resistance forces; "guerrilla warfare"; "partisan forces" | |
Adv. | 1. | underground - in or into hiding or secret operation; "the organization was driven underground" |
2. | underground - beneath the surface of the earth; "water flowing underground" |