IPA: /ˈboʊlˌhoʊl/
KK: /ˈboʊlˌhoʊl/
A safe place where someone can go to escape from danger or trouble.
After a long day, she found her bolthole in the quiet countryside.
Bolthole is formed from "bolt" (from Old English *bolt*, meaning a bar or fastening) and "hole" (from Old English *hol*, meaning an opening or hollow space). The word "bolthole" refers to a place of refuge or escape, where one can bolt or secure themselves away from danger.
Imagine a 'bar' or 'fastening' ('bolt') that keeps you safe in a 'hollow space' ('hole') — that's why a bolthole is a safe place to escape.