"dum dum bullet" meaning in English

{
  "forms": [
    {
      "form": "dum dum bullets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dum dum bullet (plural dum dum bullets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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      ],
      "glosses": [
        "Hollow-point bullet designed to expand on impact."
      ],
      "id": "en-dum_dum_bullet-en-noun-Jjv3s9KS",
      "links": [
        [
          "bullet",
          "bullet"
        ]
      ],
      "raw_glosses": [
        "(slang) Hollow-point bullet designed to expand on impact."
      ],
      "synonyms": [
        {
          "word": "dum dum#Etymology_1"
        },
        {
          "word": "dum-dum bullet"
        },
        {
          "word": "Dum-Dum bullet"
        },
        {
          "word": "Dum Dum bullet"
        }
      ],
      "tags": [
        "slang"
      ],
      "translations": [
        {
          "code": "el",
          "lang": "Greek",
          "roman": "sfaíra ntoum ntoum",
          "sense": "hollow-point bullet designed to expand on impact",
          "tags": [
            "feminine"
          ],
          "word": "σφαίρα ντουμ ντουμ"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "hollow-point bullet designed to expand on impact",
          "tags": [
            "feminine"
          ],
          "word": "bala dum-dum"
        }
      ],
      "wikipedia": [
        "expanding bullet"
      ]
    }
  ],
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    {
      "audio": "En-au-dum dum bullet.ogg",
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      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/8/8f/En-au-dum_dum_bullet.ogg"
    }
  ],
  "word": "dum dum bullet"
}

{
  "forms": [
    {
      "form": "dum dum bullets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
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      "expansion": "dum dum bullet (plural dum dum bullets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      ],
      "glosses": [
        "Hollow-point bullet designed to expand on impact."
      ],
      "links": [
        [
          "bullet",
          "bullet"
        ]
      ],
      "raw_glosses": [
        "(slang) Hollow-point bullet designed to expand on impact."
      ],
      "synonyms": [
        {
          "word": "dum dum#Etymology_1"
        }
      ],
      "tags": [
        "slang"
      ],
      "wikipedia": [
        "expanding bullet"
      ]
    }
  ],
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  ],
  "synonyms": [
    {
      "word": "dum-dum bullet"
    },
    {
      "word": "Dum-Dum bullet"
    },
    {
      "word": "Dum Dum bullet"
    }
  ],
  "translations": [
    {
      "code": "el",
      "lang": "Greek",
      "roman": "sfaíra ntoum ntoum",
      "sense": "hollow-point bullet designed to expand on impact",
      "tags": [
        "feminine"
      ],
      "word": "σφαίρα ντουμ ντουμ"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "hollow-point bullet designed to expand on impact",
      "tags": [
        "feminine"
      ],
      "word": "bala dum-dum"
    }
  ],
  "word": "dum dum bullet"
}