tunnel-n; 2 Senses

Sense Number 1: a constructed underground passageway

Commentary: TUNNEL[+entity][+artifact][+construction][+span][+navigable][+underground]

Examples:
The tunnel under they bay is closed because of an accident.
They are building a railroad tunnel right through the mountain.
Their tunnel vision about this problem is frustrating. (figurative extension)

Mappings:
WordNet 3.0 Sense Numbers: 1

Sense Number 2: a long animal burrow in the ground

Commentary: TUNNEL[+structure][+underground][+burrow][+animal]

Examples:
Moles had dug extensive tunnels under Mary's garden.

Mappings:
WordNet 3.0 Sense Numbers: 2