- under the surface of the ground
- Rescuers found victims trapped several feet underground.
- animals that live underground
- toxic waste buried deep underground
- a network of pipelines running underground
- in or into a secret place in order to hide from the police, the government, etc.
- He went underground to avoid arrest.
- If the group is outlawed they will go underground.
- Opposition groups have been driven underground.
Check pronunciation:
underground