from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A hole through which to bolt: found a bolthole in the fencing.
- n. A place affording escape.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A hole in an animal's den, or through a wall or fence, used for escape or emergency exit; i.e. a hole the animal may bolt through.
bolt + hole (Wiktionary)