: a group of people who secretly work to oppose or overthrow a government
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The National Institute of Standards and Technology identified problems with the building's original design and construction, specifically citing support columns in the underground garage that held up the pool deck.—
Manuel Bojorquez,
CBS News,
23 June 2026 Fossils dating back to the Pleistocene Age were found at this incredible site, which got its name from early settlers who thought the steam emanating from the underground space looked like smoke rising from hell.—
Elizabeth Rhodes,
Travel + Leisure,
23 June 2026 The wells were above the underground Brushy Creek Mine, which operated in the 1990s and the early 2000s.—
Adriana Pérez,
Chicago Tribune,
22 June 2026 The footage shows men and women with bags over their heads, chained to the wall in the underground tunnels, looking not that dissimilar from detainees at Abu Ghraib.—
Jen Chaney,
Vulture,
17 June 2026 See All Example Sentences for the underground