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Definition of Underground
1. Adverb. In or into hiding or secret operation. "The organization was driven underground"
2. Adjective. Under the level of the ground. "Underground caverns"
3. Noun. A secret group organized to overthrow a government or occupation force.
4. Adverb. Beneath the surface of the earth. "Water flowing underground"
5. Adjective. Conducted with or marked by hidden aims or methods. "Underground resistance"
Similar to: Covert
6. 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
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]