: a group of people who secretly work to oppose or overthrow a government
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When asked on Monday to share more about the underground complex, White House press secretary Karoline Leavitt stayed tight-lipped.—Rachel Treisman, NPR, 3 Apr. 2026 Out of the underground and into the light, the best party might just be in the next aisle or spot around the corner.—Jessi Roti, Bon Appetit Magazine, 3 Apr. 2026 The Journey Behind the Falls experience takes you 125 feet deep to give you a chance to explore the underground tunnels leading to Horseshoe Falls.—Jamie Spain, Condé Nast Traveler, 29 Mar. 2026 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 See All Example Sentences for the underground