"idle threat" meaning in English

{
  "forms": [
    {
      "form": "idle threats",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "idle threat (plural idle threats)",
      "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"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2020 December 2, Industry Insider, “The costs of cutting carbon”, in Rail, page 76:",
          "text": "Without any injection of money, Transport for London has said the project could be mothballed. This may not be an idle threat, given the future decline expected in London and South East commuting.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A threat made by a person who does not mean to carry it out, and which perhaps shouldn't be taken seriously by others."
      ],
      "id": "en-idle_threat-en-noun-RMv7hu8y"
    }
  ],
  "word": "idle threat"
}

{
  "forms": [
    {
      "form": "idle threats",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "idle threat (plural idle threats)",
      "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",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "2020 December 2, Industry Insider, “The costs of cutting carbon”, in Rail, page 76:",
          "text": "Without any injection of money, Transport for London has said the project could be mothballed. This may not be an idle threat, given the future decline expected in London and South East commuting.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A threat made by a person who does not mean to carry it out, and which perhaps shouldn't be taken seriously by others."
      ]
    }
  ],
  "word": "idle threat"
}