Definition

1. Noun:

   • An underground or underwater passage: A long, enclosed passage, typically constructed through a hill, under a body of water, or underground, used for transportation, access, or utilities.
   • A burrow or hole dug by an animal: A hole or passage in the ground made by a small animal, such as a rabbit or mole, for habitation or refuge.

2. Verb:

   • To construct or dig a tunnel: To make a tunnel by digging or boring through something.
   • To proceed by or as if by digging a tunnel: To force or make one's way through a confined or obstructed space.

Examples of Usage

• Noun:

  • The train sped through the long tunnel under the mountain.
  • We saw a rabbit disappear into its tunnel.

• Verb:

  • The engineers plan to tunnel through the rock to build the new subway line.
  • The miners tunneled deep into the earth in search of coal.

Advanced Usage

• "to tunnel into/through": To penetrate or make a passage into or through something by digging or boring.

  • The larvae tunnel into the wood, causing damage.

• "to tunnel one's way": To proceed laboriously through a confined space or obstacle.

  • Rescuers tunneled their way through the rubble after the earthquake.

Variants and Related Words

• Tunneling (gerund/noun): The action or process of constructing a tunnel.

  • The tunneling project is ahead of schedule.

• Tunnel-like (adj): Resembling a tunnel in appearance or nature.

  • The alley was dark and tunnel-like.

Synonyms

• Noun: Passage, underpass, subway (British English for pedestrian tunnel), burrow, hole.
• Verb: Bore, burrow, dig, excavate.

Related Phrasal Verbs

• Tunnel in/into: To dig or force a way into something.

  • Insects had tunneled into the old timber.

• Tunnel out/through: To dig or force a way out of or through something.

  • The prisoners attempted to tunnel out of the camp.

Related Idioms

• "Light at the end of the tunnel": A sign that a long and difficult period of hardship is coming to an end; hope for a positive resolution.

  • After months of treatment, she finally saw light at the end of the tunnel.

• "Tunnel vision": (Figurative) A narrow or limited perspective; an inability to see or consider alternative ideas or courses of action.

  • His tunnel vision on the issue prevented him from seeing the bigger picture.

Noun

1. a hole made by an animal, usually for shelter
2. a passageway through or under something, usually underground (especially one for trains or cars)
   • the tunnel reduced congestion at that intersection

Verb

1. force a way through
2. move through by or as by digging
   • burrow through the forest