Definitions of underground:
- noun: a secret group organized to overthrow a government or occupation force
- noun: electric underground railway
- adjective: conducted with or marked by hidden aims or methods
Example: "Underground resistance"
- adjective: under the level of the ground
Example: "Underground caverns"
- adjective: used of independent armed resistance forces
- adverb: beneath the surface of the earth
Example: "Water flowing underground"
- adverb: in or into hiding or secret operation
Example: "The organization was driven underground"
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