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Discover Ludwig"the underground" is correct and usable in written English.
For example, you could use it to refer to a subway or metro system: "Jessica took the underground to work every day."
Dictionary
the underground
adjective
Below the ground; below the surface of the Earth.
Exact(60)
And the underground reading?
Others the underground marathon.
Why the underground press?
The "underground" strategy adds cachet.
The underground took various forms.
"It's feeding the underground scene".
Bombs on the underground!
They're on the Underground.
Just the underground.
That was the underground".
"Fuck the underground!
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com