as in caves
a passage that goes under the ground, through a hill, etc.
The train goes through a tunnel in the mountain. The moles dug tunnels in the yard.
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Recent Examples of tunnels
The approach targets environments where satellite signals are weak or unavailable, such as tunnels, dense cities, forests, or conflict zones.
—
Neetika Walter, Interesting Engineering, 3 Apr. 2026
Combat medics, optometrists, doctors, veterinarians and other medical personnel simulated a mass casualty event in combat conditions in underground tunnels on the Fort Hood base.
—Chelsea Torres, FOXNews.com, 2 Apr. 2026
Adult carrot flies lay their eggs near carrots, and when those eggs hatch, the larvae burrow into the soil and chew holes and tunnels in the carrot roots.
—Lauren Landers, Better Homes & Gardens, 2 Apr. 2026
See the colossal sea cliffs of Kitayamazaki Cape, trek through tunnels carved into coastlines, and enjoy some culture along the way, with stops in seaside villages or visits to landmarks like the Iwate Tsunami Memorial Museum.
—Zoe Baillargeon, Travel + Leisure, 1 Apr. 2026
Barcelona’s ramblas are wrapped in crystal tunnels.
—Big Think, 31 Mar. 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
Musk’s Boring Company in July announced plans to build 20 miles of tunnels underneath existing highways to transport people between Nashville International Airport and downtown’s lower Broadway in about 10 minutes.
—Marco Quiroz-Gutierrez, Fortune, 28 Mar. 2026
Breaching the tunnels Once the perimeter is secure, the commandos would attempt to breach the fortified tunnels that lead to the uranium stockpiles.
—Sheena Samu, CBS News, 27 Mar. 2026
Neetika Walter, Interesting Engineering, 3 Apr. 2026
Combat medics, optometrists, doctors, veterinarians and other medical personnel simulated a mass casualty event in combat conditions in underground tunnels on the Fort Hood base.
—Chelsea Torres, FOXNews.com, 2 Apr. 2026
Adult carrot flies lay their eggs near carrots, and when those eggs hatch, the larvae burrow into the soil and chew holes and tunnels in the carrot roots.
—Lauren Landers, Better Homes & Gardens, 2 Apr. 2026
See the colossal sea cliffs of Kitayamazaki Cape, trek through tunnels carved into coastlines, and enjoy some culture along the way, with stops in seaside villages or visits to landmarks like the Iwate Tsunami Memorial Museum.
—Zoe Baillargeon, Travel + Leisure, 1 Apr. 2026
Barcelona’s ramblas are wrapped in crystal tunnels.
—Big Think, 31 Mar. 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
Musk’s Boring Company in July announced plans to build 20 miles of tunnels underneath existing highways to transport people between Nashville International Airport and downtown’s lower Broadway in about 10 minutes.
—Marco Quiroz-Gutierrez, Fortune, 28 Mar. 2026
Breaching the tunnels Once the perimeter is secure, the commandos would attempt to breach the fortified tunnels that lead to the uranium stockpiles.
—Sheena Samu, CBS News, 27 Mar. 2026
Recent Examples of Synonyms for tunnels
Noun
-
From caves that stretch for hundreds of miles to grand estates and pristine Gulf Coast beaches, these destinations offer something for travelers of every age — and many are within driving distance of DFW.—
Lauren Schuster,
Fort Worth Star-Telegram,
1 Apr. 2026
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Those hard things included scaling thousand-foot peaks in Yosemite Valley and spending nights in snow caves under a single sleeping bag shared by the whole family — all before Caldwell had finished his first year of elementary school.—
Namir Khaliq,
Big Think,
31 Mar. 2026
Noun
-
There could be more caverns beyond.—
Nicole Young,
CBS News,
29 Mar. 2026
-
Few caverns possess the same cache of fossils as Bender’s Cave, however.—
Andrew Paul,
Popular Science,
26 Mar. 2026
Cite this Entry
“Tunnels.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/tunnels. Accessed 7 Apr. 2026.
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