Definition of "tunneling" []

• In quantum mechanics, the passing of a particle through a seemingly impenetrable barrier without a cause that is explainable by classical physics. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The deep bore tunneling is the most riskiest but clearly not the only piece of cost overruns."
• "I love how they used the ‘tunneling from the store next door’ device from Small Time Crooks to rape our skulls."
• "The probability of something like that happening (like the probability of tunneling from a vacuum A to vacuum B in your lifetime) is astronomically low."