bolt-hole
/ˈbəʊlthəʊl/noun
1- chiefly Brit. a hole or burrow by which a rabbit or other wild animal can escape〈主英〉（野兔或其他野生动物的）逃生洞穴。
1.1
- figurative a place where a person can escape and hide〈喻〉避难所：
he thought of Antwerp as a possible bolt-hole.
他认为安特卫普是个藏身之地。