"deadweight" meaning in English

{
  "forms": [
    {
      "form": "deadweights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "deadweight (plural deadweights)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "dead weight"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
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      "examples": [
        {
          "bold_text_offsets": [
            [
              79,
              89
            ]
          ],
          "ref": "1960 April, “New Bridge for Modernisation in Manchester”, in Railway Magazine, page 248:",
          "text": "The bridge has been designed for a total dead-cum-live load of 5,750 tons, the deadweight of the new structure excluding station buildings and permanent way being some 3,000 tons.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of dead weight."
      ],
      "id": "en-deadweight-en-noun-CEm7yr4z",
      "links": [
        [
          "dead weight",
          "dead weight#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
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    }
  ],
  "word": "deadweight"
}

{
  "forms": [
    {
      "form": "deadweights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "deadweight (plural deadweights)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "dead weight"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms with quotations",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              79,
              89
            ]
          ],
          "ref": "1960 April, “New Bridge for Modernisation in Manchester”, in Railway Magazine, page 248:",
          "text": "The bridge has been designed for a total dead-cum-live load of 5,750 tons, the deadweight of the new structure excluding station buildings and permanent way being some 3,000 tons.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of dead weight."
      ],
      "links": [
        [
          "dead weight",
          "dead weight#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "deadweight"
}