Definitions:

1. a hole made by an animal, usually for shelter noun
   • The spider came out of the tunnel to catch insects.
2. a passageway through or under something, usually underground, especially one for trains or cars noun
   • The tunnel reduced congestion at the narrow intersection.
3. move through by or as by digging verb
   • The miners tunnel through the rock to find the gold.
4. to force a way through verb
   • We will have to tunnel the crowd to get to the exit.

Synonyms:

• burrow