tunneling

Short definition from Wiktionary

Noun

1. 1
   The act of burrowing a tunnel.
2. 2
   The practice of exploring tunnel.
3. 3
   The quantum mechanical passing of a particle through an energy barrier.
4. 4
   A type of fraud where assets and profits are transferred out of firms for the benefit of those who control them.
5. 5
   A feature of the file system that allows files to preserve certain properties, such as creation date, even after being deleted and recreated.

Verb

1. 1
   present participle and gerund of tunnel