A mining excavation in the form of a terrace of steps.
The other smell […] that worked its way into your clothes, your skin, your spirit, believed here to rise by way of long-deserted drifts and stopes, from the everyday atmosphere of Hell itself.
Apparently related to step, but with uncertain phonological development. Perhaps from a German Low German word like Stoop (“step”), from Middle Low German stōpe (“step”). More at stoop.
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