Definition of tunnel noun from the Oxford Advanced American Dictionary

      

    tunnel

     noun
    noun
    NAmE//ˈtʌnl//
     
     
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  1. 1 a passage built underground, for example to allow a road or railroad to go through a hill, under a river, etc. a railway/railroad tunnel the Lincoln Tunnel see also wind tunnel
  2. 2an underground passage made by an animal
  3. Idioms
    light at the end of the tunnel
     
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    something that shows you are nearly at the end of a long and difficult time or situation
See the Oxford Advanced Learner's Dictionary entry: tunnel