"coals to Newcastle" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "coal"
      },
      "expansion": "coal",
      "name": "l"
    }
  ],
  "etymology_text": "Newcastle upon Tyne and Newcastle, New South Wales were major coal-exporting cities, so sending coal there would be pointless.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "coals to Newcastle pl (plural only)",
      "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",
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          "source": "w"
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          "kind": "other",
          "name": "English pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
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          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1935, attributed to King George V of the United Kingdom (but possibly a then-circulating joke; see wikiquote)",
          "text": "No more coals to Newcastle, no more Hoares to Paris."
        }
      ],
      "glosses": [
        "A pointless venture, in the sense of sending something to a place where it is made, or where they already have an abundance."
      ],
      "id": "en-coals_to_Newcastle-en-noun-YGPUh-FY",
      "links": [
        [
          "venture",
          "venture"
        ],
        [
          "abundance",
          "abundance"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) A pointless venture, in the sense of sending something to a place where it is made, or where they already have an abundance."
      ],
      "related": [
        {
          "word": "carry coals to Newcastle"
        }
      ],
      "synonyms": [
        {
          "word": "owls to Athens"
        }
      ],
      "tags": [
        "idiomatic",
        "plural",
        "plural-only"
      ],
      "wikipedia": [
        "Newcastle upon Tyne",
        "Newcastle, New South Wales"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-coals to Newcastle.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/e6/En-au-coals_to_Newcastle.ogg/En-au-coals_to_Newcastle.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/e/e6/En-au-coals_to_Newcastle.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "coals to Newcastle"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "coal"
      },
      "expansion": "coal",
      "name": "l"
    }
  ],
  "etymology_text": "Newcastle upon Tyne and Newcastle, New South Wales were major coal-exporting cities, so sending coal there would be pointless.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "coals to Newcastle pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "carry coals to Newcastle"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English pluralia tantum",
        "English terms with audio links"
      ],
      "examples": [
        {
          "ref": "1935, attributed to King George V of the United Kingdom (but possibly a then-circulating joke; see wikiquote)",
          "text": "No more coals to Newcastle, no more Hoares to Paris."
        }
      ],
      "glosses": [
        "A pointless venture, in the sense of sending something to a place where it is made, or where they already have an abundance."
      ],
      "links": [
        [
          "venture",
          "venture"
        ],
        [
          "abundance",
          "abundance"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) A pointless venture, in the sense of sending something to a place where it is made, or where they already have an abundance."
      ],
      "synonyms": [
        {
          "word": "owls to Athens"
        }
      ],
      "tags": [
        "idiomatic",
        "plural",
        "plural-only"
      ],
      "wikipedia": [
        "Newcastle upon Tyne",
        "Newcastle, New South Wales"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-coals to Newcastle.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/e6/En-au-coals_to_Newcastle.ogg/En-au-coals_to_Newcastle.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/e/e6/En-au-coals_to_Newcastle.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "coals to Newcastle"
}