: a group of people who secretly work to oppose or overthrow a government
Examples of the underground in a Sentence
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This lower level—which also includes a spa with a treatment room and hammam—benefits from a gallery-like corridor topped by skylights that pull natural light into the underground spaces.—
Tori Latham,
Robb Report,
14 Oct. 2026 Following a major eruption in 2018 that partly drained one of the underground lava reservoirs, there were indications that it was being steadily refilled.—
John Timmer,
ArsTechnica,
9 Oct. 2026 Losing power was especially painful for Sunshine Bay because the underground parking garage relies on a hardwired stormwater pump to keep the garage dry when the streets start to flood.—
Alex Harris,
Miami Herald,
6 Oct. 2026 Police had initially said in a Facebook post that students were evacuated and being sent home early due to the underground gas leak.—
Bri Buckley,
CBS News,
5 Oct. 2026 See All Example Sentences for the underground