: a group of people who secretly work to oppose or overthrow a government
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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 The entrances to the underground facilities that were bombed have been buried and shuttered with cement.—Melissa Quinn, CBS News, 19 Mar. 2026 The outage froze escalators and security screening conveyor belts and stalled the underground trains linking DIA’s main terminal to concourses.—Bruce Finley, Denver Post, 18 Mar. 2026 See All Example Sentences for the underground
“The underground.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/the%20underground. Accessed 28 Mar. 2026.