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English definition of “tunnel”

tunnel

noun [C]  /ˈtʌn·əl/ us  
a long passage under or through the earth, esp. one made for vehicles: The train entered the tunnel.

tunnel

verb [I/T]  /ˈtʌn·əl/ (-l-, -ll-) us  
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)
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