| underground | |
| 1. adj. (not comparable) Below the ground; below the surface of the Earth. | |
| There is an underground tunnel that takes you across the river. | |
| 2. adj. (anchor, hidden)Hidden, furtive, secretive. | |
| These criminals operate through an underground network. | |
| 3. adj. Of music, art, etc, outside the mainstream. | |
| 4. adv. Below the ground. | |
| The tunnel goes underground at this point. | |
| 5. adv. Secretly. | |
| 6. n. (chiefly British) An underground railway. | |
| 7. n. (with "the") A movement or organisation of people who resist political convention. | |
| 8. n. (with "the") A movement or organisation of people who resist artistic convention. | |
| 9. v. To route electricity distribution cables underground | |
