un
der
ground
Plural
undergrounds
1
a city's railway system that is below the ground, usually in big cities
- The underground system in London is one of the oldest and most extensive in the world.
- Commuters rely on the underground to navigate the bustling city quickly and efficiently.
- During rush hour, the underground trains can be quite crowded, making it difficult to find a seat.
- She purchased a monthly pass for the underground to save money on her daily commute.
- The city has made significant investments in upgrading the underground infrastructure to improve safety and service.
2
a group or organization that operates secretly to resist or overthrow a government or authority
- The underground played a crucial role in organizing protests against the oppressive regime.
- During the war, the underground provided intelligence and support to the resistance fighters.
- Members of the underground risked their lives to distribute anti-government pamphlets.
- The underground was instrumental in helping political prisoners escape to safety.
- The government launched an extensive operation to dismantle the underground and its networks.
Synonyms: