underground Meaning and Definition
1. n. an electric railway operating below the surface of the ground (usually in a city)
2. n. a secret group organized to overthrow a government or occupation force
3. r. beneath the surface of the earth
4. r. in or into hiding or secret operation
5. s. conducted with or marked by hidden aims or methods
6. s. under the level of the ground
Underground most commonly refers to:
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