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  1. Dictionary
    Tun·nel
    /ˈtən(ə)l/

    noun

    • 1. an artificial underground passage, especially one built through a hill or under a building, road, or river.

    verb

    • 1. dig or force a passage underground or through something: "he tunneled under the fence"
    • 2. (of a particle) pass through a potential barrier.