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
Two mile-long tunnels break up the bridge sections to allow ships to pass in the bay.
—
Betsy Cribb Watson, Southern Living, 10 Apr. 2026
There’s never been a fatality caused by a vehicle fire in the Colorado I-70 mountain tunnels.
—Bruce Finley, Denver Post, 9 Apr. 2026
Campers can attach multiple tents together and secure on various awnings to create shaded entries, auxiliary rooms and tunnels.
—New Atlas, 9 Apr. 2026
Workers find food and dig tunnels.
—Ana Durrani, USA Today, 9 Apr. 2026
The gray work meant new pumps and tunnels to move stormwater from the street to the sea.
—Eric Klinenberg, New Yorker, 6 Apr. 2026
The big issue is going to be the bridges and tunnels.
—Chris Hoffman, CBS News, 6 Apr. 2026
Nutrients streamed in both directions through the hyphal tunnels.
—Quanta Magazine, 6 Apr. 2026
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
Betsy Cribb Watson, Southern Living, 10 Apr. 2026
There’s never been a fatality caused by a vehicle fire in the Colorado I-70 mountain tunnels.
—Bruce Finley, Denver Post, 9 Apr. 2026
Campers can attach multiple tents together and secure on various awnings to create shaded entries, auxiliary rooms and tunnels.
—New Atlas, 9 Apr. 2026
Workers find food and dig tunnels.
—Ana Durrani, USA Today, 9 Apr. 2026
The gray work meant new pumps and tunnels to move stormwater from the street to the sea.
—Eric Klinenberg, New Yorker, 6 Apr. 2026
The big issue is going to be the bridges and tunnels.
—Chris Hoffman, CBS News, 6 Apr. 2026
Nutrients streamed in both directions through the hyphal tunnels.
—Quanta Magazine, 6 Apr. 2026
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
Recent Examples of Synonyms for tunnels
Noun
-
Find rooms with private terraces, pools, and even caves, all with gorgeous caldera views.—
Stacey Leasca,
Travel + Leisure,
15 Apr. 2026
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Located in the northeastern part of the Buckeye State, this day-use state park rocks similar rugged cliffs, cascading waterfalls, and caves without the overcrowded parking lots.—
Joie Probst,
Midwest Living,
10 Apr. 2026
Noun
-
Hard-core adventurers can opt for the Wild Cave Tour, a four-hour exploration that takes you a mile deeper into the bowels of the caverns.—
Kristy Tolley,
Travel + Leisure,
14 Apr. 2026
-
But Hezbollah is known to operate a network of underground tunnels and caverns.—
Lauren Frayer,
NPR,
12 Apr. 2026
Cite this Entry
“Tunnels.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/tunnels. Accessed 21 Apr. 2026.
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