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is tunnelling
  • present progressive of tunnel (3rd person singular).

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Morris Blood is tunnelling on the Pilot branch this morning; it's bad up there, but the main line is clear from end to end.

From The Daughter of a Magnate by Spearman, Frank H. (Frank Hamilton)