"room and pillar" meaning in All languages combined

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      "expansion": "room and pillar (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "Mining",
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      ],
      "glosses": [
        "A variant of breast stoping in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars."
      ],
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      "raw_glosses": [
        "(mining) A variant of breast stoping in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars."
      ],
      "synonyms": [
        {
          "word": "pillar and stall"
        }
      ],
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        "uncountable"
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      "topics": [
        "business",
        "mining"
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  "word": "room and pillar"
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        "A variant of breast stoping in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars."
      ],
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        "(mining) A variant of breast stoping in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars."
      ],
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          "word": "pillar and stall"
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