"moving staircase" meaning in English

{
  "forms": [
    {
      "form": "moving staircases",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "moving staircase (plural moving staircases)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "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"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2008, John Irwin, Modern Britain: An Economic and Social History, page 27:",
          "text": "In terms of the income scale British society has been compared to a group of people on a moving staircase. While the staircase as a whole moves upwards the relative position of the people on it remains largely unchanged.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An escalator."
      ],
      "id": "en-moving_staircase-en-noun-eGGwMGpd",
      "links": [
        [
          "escalator",
          "escalator"
        ]
      ],
      "raw_glosses": [
        "(UK) An escalator."
      ],
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "moving staircase"
}

{
  "forms": [
    {
      "form": "moving staircases",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "moving staircase (plural moving staircases)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2008, John Irwin, Modern Britain: An Economic and Social History, page 27:",
          "text": "In terms of the income scale British society has been compared to a group of people on a moving staircase. While the staircase as a whole moves upwards the relative position of the people on it remains largely unchanged.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An escalator."
      ],
      "links": [
        [
          "escalator",
          "escalator"
        ]
      ],
      "raw_glosses": [
        "(UK) An escalator."
      ],
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "moving staircase"
}