tunnel
🇺🇸
/ˈtʌnl/
🇬🇧
/ˈtʌnl/
An underground passage for roads, trains, or people to go through hills or under rivers.
The train goes through a long tunnel under the mountain.
An underground passage made by animals or natural forces.
Rabbits live in a tunnel under the ground.
To dig an underground passage.
Workers tunnel through the rock to build the road.