: a group of people who secretly work to oppose or overthrow a government
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So, that December, my parents woke me up in the middle of the night for our last cross-country drive through the underground.—Zayd Ayers Dohrn, New Yorker, 28 Mar. 2026 Some parts of the renovation are more a monument to the past, notably the underground vault area where gold was once stored.—Graham Womack, Sacbee.com, 23 Mar. 2026 The latter means the federal government owns the underground mineral rights, while another entity, such as a state government or a private landowner, owns the surface.—Madison Dapcevich, Outside, 20 Mar. 2026 Their interviews with two Black women members of the underground Abortion Counseling Service in Chicago—code named Jane—is particularly interesting.—Literary Hub, 20 Mar. 2026 See All Example Sentences for the underground