[onlybeforenoun]
1 under the surface of the ground:
underground passages / caves / streams * underground cables
compareOVERGROUND
2 operating secretly and often illegally, especially against a government:
an underground resistance movement
Part of speech: adverb
1 under the surface of the ground:
Rescuers found victims trapped several feet underground. * toxic waste buried deep underground * a network of pipelines running underground
2 in or into a secret place in order to hide from the police, the government, etc:
He went underground to avoid arrest.
Part of speech: noun
1 (often the Underground) (BrE) (AmE subway) [sing.] an underground railway/railroad system in a city:
underground stations * the London Underground * I always travel by underground.
compareMETRO, TUBE
2 (the underground) [sing.+sing./pl.v.] a secret political organization, usually working against the government of a country
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BRITISH/AMERICAN
underground / subway / metro / tube
A city's underground railway / railroad system is usually called the underground (often the Underground) in BrE and the subway in AmE. Speakers of BrE also use subway for systems in American cities and metro for systems in other European countries. The Metro is the name for the systems in Paris and Washington, D.C. London's system is often called the Tube.
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About this entry
This is a English–English dictionary entry.
Sourced from Main Dictionary in Lughet's collection.
This word also appears under other sources in Lughet's collection — see the list below.
Where does this definition of underground come from?
This entry for underground is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is underground a noun, verb, or something else?
In this entry, underground is tagged as adjective.
Does underground appear elsewhere on Lughet?
Yes — underground appears under other sources or language pairs in Lughet's collection. See the list below.
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.
