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say it: UHN-dur-grownd
underground is a noun, adjective and adverb meaning "a secret group organized to overthrow a government or occupation force". It carries 6 recorded senses.
a secret group organized to overthrow a government or occupation force
an electric railway operating below the surface of the ground (usually in a city)
“in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'”
under the level of the ground
“belowground storage areas”
“underground caverns”
conducted with or marked by hidden aims or methods
“clandestine intelligence operations”
“cloak-and-dagger activities behind enemy lines”
“hole-and-corner intrigue”
“secret missions”
“a secret agent”
“secret sales of arms”
“surreptitious mobilization of troops”
“an undercover investigation”
“underground resistance”
in or into hiding or secret operation
“the organization was driven underground”
beneath the surface of the earth
“water flowing underground”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for underground come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.