Definitions

1. noun

A passage, especially underground, through a mountain, hill, or other obstacle, for a road, railway, or canal.

“The train traveled through a long tunnel on its way to Paris.”

2. verb

To travel or move through a narrow passage, especially a tunnel.

“The hikers had to tunnel through the dense forest to reach the campsite.”

3. noun

A secret or hidden way, especially of doing something.

“The company used a tunnel of corruption to avoid paying taxes.”

4. noun

A narrow passage or channel, especially in the body, such as the tunnel of vision or the Eustachian tunnel.

“The doctor examined the patient’s Eustachian tunnel to diagnose the problem.”