bolt–hole

something (as a building) that offers cover from the weather or protection from danger <her cottage in the Lake District served as her bolt-hole whenever the stresses of London became too great> Synonyms asylum, bolt-hole [chiefly British], harbor, harborage, haven, refuge, retreat, sanctuary, sanctumRelated Words oasis; anchorage, mooring, port; cover, screen; abode, diggings, domicile, dwelling, habitation, house, housing, lodging, lodgment (or lodgement), pad, place, quarters, residence, rest, roof; cloister, closet, covert, den, hermitage, hideaway, hideout, lair; castle, fastness, fort, fortress, palisade, redoubt, stronghold; lean-to, lee, shed, windbreak