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English definition of “tunnel”

tunnel

noun [C] uk   /ˈtʌn.əl/ us  
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

tunnel

verb [I or T] uk   /ˈtʌn.əl/ (-ll- or US usually -l-) us  
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.
tunneller
noun [C] uk UK (US tunneler)   /r/ us    //
(Definition of tunnel from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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