Tunnel
Definition 1 of 4
Pro Tip 1/3
Physical Structures
Used to describe structures allowing transportation through obstacles. The new tunnel connects two major cities.
Pro Tip 2/3
Metaphorical Use
Sometimes 'tunnel' may represent a challenge or journey in life. He's going through a dark tunnel, but he'll emerge stronger.
Pro Tip 3/3
Not Always Underground
Tunnels can be above ground, like wildlife crossings over highways. The wildlife tunnel helps animals cross safely.