room-and-pillar

[ room-uhn-pil-er, room- ]
/ ˈrum ənˈpɪl ər, ˈrʊm- /

adjective Mining.

noting a means of extracting coal or other minerals from underground deposits by first cutting out rooms, then robbing the pillars between them; pillar-and-breast.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020