"table rapping" meaning in English

{
  "forms": [
    {
      "form": "table rappings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "table rapping (countable and uncountable, plural table rappings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1936, Rollo Ahmed, The Black Art, London: Long, page 229",
          "text": "I wish it were possible to impress this truth upon people who rush into spiritualism from curiosity, or who try \"table rapping\" or some similar phenomenon \"for fun\".",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A rapping noise made, purportedly by spirits of the dead, on the table at which a seance is held."
      ],
      "id": "en-table_rapping-en-noun-oAYwR8R6",
      "links": [
        [
          "rapping",
          "rapping"
        ],
        [
          "noise",
          "noise"
        ],
        [
          "spirit",
          "spirit"
        ],
        [
          "table",
          "table"
        ],
        [
          "seance",
          "seance"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "table rapping"
}

{
  "forms": [
    {
      "form": "table rappings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "table rapping (countable and uncountable, plural table rappings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "English uncountable nouns",
        "Pages with 1 entry"
      ],
      "examples": [
        {
          "ref": "1936, Rollo Ahmed, The Black Art, London: Long, page 229",
          "text": "I wish it were possible to impress this truth upon people who rush into spiritualism from curiosity, or who try \"table rapping\" or some similar phenomenon \"for fun\".",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A rapping noise made, purportedly by spirits of the dead, on the table at which a seance is held."
      ],
      "links": [
        [
          "rapping",
          "rapping"
        ],
        [
          "noise",
          "noise"
        ],
        [
          "spirit",
          "spirit"
        ],
        [
          "table",
          "table"
        ],
        [
          "seance",
          "seance"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "table rapping"
}