Wiktionary
n. 1 a means of escape 2 a place of escape or secret refuge
WordNet
n. a hole through which an animal may bolt when pursued into its burrow or den
Usage examples of "bolt-hole".
Swearing in Italian, Lummy let go of his victim and looked around for a bolt-hole.
The faint odour of naphtha could be detected as the breeze from the open bolt-hole pushed the pungent fumes up the vents.
Decidius Saxa and Gaius Norbanus Flaccus had already taken eight of the twenty-eight legions across the Adriatic to Apollonia, under orders to march east on the Via Egnatia until they found an impregnable bolt-hole in which they could sit and wait for the bulk of the army to catch them up.
It brings us to the debacle at Ostia, the stalemate in Crete, the inviolability of every pirate bolt-hole from Gades in Spain to Gaza in Palestina!
Flashy was being sent into the deep field - clean-shaven, too, and never a bolt-hole or friend-in-need to bless himself with.
No doubt he would have fled after Corky’s first visit had he not believed that Corky, as Robin Goodfellow, knew the location of every one of his bolt-holes and would descend on him in his hideaway with a company of cutthroat mailmen who would show no mercy.
Following the holoprojection of Rhombur, they had separated for security purposes, finding different bolt-holes in which to live.
In order that no escape route or bolt-holes would be left open to the locators and their armed watchdog, he and Lord Szwart had agreed to enter the Tundza by the door, while Vavara would break in through the window with her hypnotic, lying aura preceding her, befuddling the senses of those within .