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Definition of Underground
1. Noun. A secret group organized to overthrow a government or occupation force.
2. Adjective. Under the level of the ground. "Underground caverns"
3. Adverb. In or into hiding or secret operation. "The organization was driven underground"
4. Noun. An electric railway operating below the surface of the ground (usually in a city). "In Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
Generic synonyms: Railroad, Railroad Line, Railway, Railway Line, Railway System
5. Adjective. Conducted with or marked by hidden aims or methods. "Underground resistance"
Similar to: Covert
6. Adverb. Beneath the surface of the earth. "Water flowing underground"
Definition of Underground
1. n. The place or space beneath the surface of the ground; subterranean space.
2. a. Being below the surface of the ground; as, an underground story or apartment.
3. adv. Beneath the surface of the earth.
4. n. The place or space beneath the surface of the ground; subterranean space.
5. a. Being below the surface of the ground; as, an underground story or apartment.
6. adv. Beneath the surface of the earth.
Definition of Underground
1. Proper noun. (British) The London Underground. ¹
2. Adjective. (not comparable) Below the ground; below the surface of the Earth. ¹
3. Adjective. Hidden, furtive, secretive. ¹
4. Adjective. Of music, art, etc, outside the mainstream. ¹
5. Adverb. Below the ground. ¹
6. Adverb. Secretly. ¹
7. Noun. (chiefly British) An underground railway. ¹
8. Noun. (context: with "the") A movement or organisation of people who resist political convention. ¹
9. Noun. (context: with "the") A movement or organisation of people who resist artistic convention. ¹
10. Verb. To route electricity distribution cables underground ¹
¹ Source: wiktionary.com
Definition of Underground
1. [n -S]