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
This is software that encrypts data traffic and routes it through private tunnels to secure servers to prevent anyone from being able to read it.
—
ABC News, 22 Apr. 2026
This timing falls between the emergence of the latest generation and the reuse of a gallery as an overwintering shelter, so the tunnels should be vacant when sealed.
—Miri Talabac, Baltimore Sun, 21 Apr. 2026
The property also became known for its network of private tunnels that allowed guests to move discreetly throughout the resort.
—Colson Thayer, PEOPLE, 21 Apr. 2026
It's believed those containers are in tunnels so far below ground, America's bunker busting bombs may not be able to reach them.
—Cecilia Vega, CBS News, 19 Apr. 2026
Use Vibration Stakes Groundhogs rely on their exceptional vibration sensitivity to navigate tunnels and locate food sources, such as grubs.
—Michelle Mastro, Martha Stewart, 18 Apr. 2026
Although row covers and grow tunnels are not entirely effective against groundhogs, covering up garden plants with these products can make groundhogs less likely to nibble on your vegetables.
—Lauren Landers, Better Homes & Gardens, 17 Apr. 2026
Metro 2039 will return players to the tunnels of the Moscow metro.
—Kyle Orland, ArsTechnica, 16 Apr. 2026
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
ABC News, 22 Apr. 2026
This timing falls between the emergence of the latest generation and the reuse of a gallery as an overwintering shelter, so the tunnels should be vacant when sealed.
—Miri Talabac, Baltimore Sun, 21 Apr. 2026
The property also became known for its network of private tunnels that allowed guests to move discreetly throughout the resort.
—Colson Thayer, PEOPLE, 21 Apr. 2026
It's believed those containers are in tunnels so far below ground, America's bunker busting bombs may not be able to reach them.
—Cecilia Vega, CBS News, 19 Apr. 2026
Use Vibration Stakes Groundhogs rely on their exceptional vibration sensitivity to navigate tunnels and locate food sources, such as grubs.
—Michelle Mastro, Martha Stewart, 18 Apr. 2026
Although row covers and grow tunnels are not entirely effective against groundhogs, covering up garden plants with these products can make groundhogs less likely to nibble on your vegetables.
—Lauren Landers, Better Homes & Gardens, 17 Apr. 2026
Metro 2039 will return players to the tunnels of the Moscow metro.
—Kyle Orland, ArsTechnica, 16 Apr. 2026
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
Recent Examples of Synonyms for tunnels
Noun
-
In some sea caves, harbor seals rest in the quiet shade.—
Tribune News Service,
Baltimore Sun,
29 Apr. 2026
-
Families can embark on thrilling excursions like whale watching tours or exploring the ice caves of Mendenhall Glacier while in port.—
Jessica Puckett,
Boston Herald,
26 Apr. 2026
Noun
-
These caverns are considered suitable for hydrogen storage because of their tight sealing properties and structural stability.—
Sujita Sinha,
Interesting Engineering,
27 Apr. 2026
-
Explore a Cave Niagara Cave in Harmony is one of Midwest's largest limestone caverns, with a nearly 60-foot waterfall.—
Robin Pfeifer,
Midwest Living,
23 Apr. 2026
Cite this Entry
“Tunnels.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/tunnels. Accessed 1 May. 2026.
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