An underground passage or hole, especially one that has been manually created
“As they moved into another tunnel, Haddad saw that it opened out into a space that could have been a bunkhouse or a storage supply.”
An underground hole or space
“She was underground in a tunnel somewhere, the babes in her arms crying because they'd felt the last gasp of their mother.”
A large, naturally-occurring cavity formed underground, or in the face of a cliff or a hillside
A small or narrow passage within a structure
Intricate underground maze of tunnels, resembling a labyrinthine cavern
An aperture or opening through a surface or barrier
To dig a passage or hole (through a barrier)
“There is a finite but small probability that the electron will tunnel its way through the barrier and emerge from the box.”
To cause to be severely weakened or powerless
To dig or reach into something, sometimes figuratively
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