Plural of bolthole; multiple small hidden openings or secluded places used for escape or retreat.
Standard English plural formation of 'bolthole,' adding the -s suffix. Maintains the compound structure while indicating more than one such opening or refuge.
Cities like London still have hundreds of unrecorded boltholes from various historical periods—some dug by smugglers, others by political refugees—making urban archaeology a real-world treasure hunt beneath our feet.
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