To dig underneath (something), to make a passage for destructive or military purposes; to sap.
To weaken or work against; to hinder, sabotage.
To erode the base or foundation of something, e.g. by the action of water.
To make porous or permeable through the formation of small holes or tunnels.
A location in a monitor program containing the address of a routine, allowing the user to substitute different functionality.
A hole burrowed by a worm.
A hypothetical shortcut between two points in spacetime, permitting faster-than-light travel and sometimes time travel.