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Underground
01
a city's railway system that is below the ground, usually in big cities
02
a secret group organized to overthrow a government or occupation force
underground
01
situated, operating, or existing beneath the surface of the ground
02
conducted with or marked by hidden aims or methods
Example
Commuters rely on the underground to navigate the bustling city quickly and efficiently.
She purchased a monthly pass for the underground to save money on her daily commute.
They discovered a profound underground aquifer that could provide water for the entire region.
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