Meaning of “tunnel” in the English Dictionary

"tunnel" in British English

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tunnelnoun [ C ]

uk /ˈtʌn.əl/ us /ˈtʌn.əl/

B1 a long passage under or through the ground, especially one made by people:

The train went into the tunnel.
the tunnel

the long passage through which football, rugby etc. players walk to get to the pitch

More examples

tunnelverb [ I or T ]

uk /ˈtʌn.əl/ us /ˈtʌn.əl/ -ll- or US usually -l-

to dig a tunnel:

The decision has not yet been made whether to tunnel under the river or build a bridge over it.
The alternative is to tunnel a route through the mountain.
He was trapped in a collapsed building but managed to tunnel his way out.
noun [ C ] UK US tunneler uk /ˈtʌn.əl.ər/ us /ˈtʌn.əl.ɚ/

(Definition of “tunnel” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"tunnel" in American English

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tunnelnoun [ C ]

us /ˈtʌn·əl/

a long passage under or through the earth, esp. one made for vehicles:

The train entered the tunnel.

tunnelverb [ I/T ]

us /ˈtʌn·əl/ -l-, -ll-

to dig a tunnel:

[ I ] Earthworms digest organic matter as they tunnel.
[ T ] The people trapped in the collapsed building had to tunnel their way out.

(Definition of “tunnel” from the Cambridge Academic Content Dictionary © Cambridge University Press)