"terror bird" meaning in English

{
  "forms": [
    {
      "form": "terror birds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "terror bird (plural terror birds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Dutch translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with German translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Korean translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Portuguese translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Birds",
          "orig": "en:Birds",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Any of the family Phorusrhacidae of extinct flightless birds endemic to South America during the Cenozoic; a phorusrhacid."
      ],
      "id": "en-terror_bird-en-noun-ehxzTF6Z",
      "links": [
        [
          "Phorusrhacidae",
          "Phorusrhacidae#Translingual"
        ],
        [
          "bird",
          "bird"
        ],
        [
          "South America",
          "South America"
        ],
        [
          "Cenozoic",
          "Cenozoic"
        ],
        [
          "phorusrhacid",
          "phorusrhacid"
        ]
      ],
      "translations": [
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "phorusrhacid",
          "tags": [
            "masculine"
          ],
          "word": "schrikvogel"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "phorusrhacid",
          "tags": [
            "neuter"
          ],
          "word": "Terrorvogel"
        },
        {
          "code": "ko",
          "lang": "Korean",
          "roman": "gongposae",
          "sense": "phorusrhacid",
          "word": "공포새"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "phorusrhacid",
          "tags": [
            "feminine"
          ],
          "word": "ave do terror"
        }
      ],
      "wikipedia": [
        "terror bird"
      ]
    }
  ],
  "word": "terror bird"
}

{
  "forms": [
    {
      "form": "terror birds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "terror bird (plural terror birds)",
      "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",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Dutch translations",
        "Terms with German translations",
        "Terms with Korean translations",
        "Terms with Portuguese translations",
        "en:Birds"
      ],
      "glosses": [
        "Any of the family Phorusrhacidae of extinct flightless birds endemic to South America during the Cenozoic; a phorusrhacid."
      ],
      "links": [
        [
          "Phorusrhacidae",
          "Phorusrhacidae#Translingual"
        ],
        [
          "bird",
          "bird"
        ],
        [
          "South America",
          "South America"
        ],
        [
          "Cenozoic",
          "Cenozoic"
        ],
        [
          "phorusrhacid",
          "phorusrhacid"
        ]
      ],
      "wikipedia": [
        "terror bird"
      ]
    }
  ],
  "translations": [
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "phorusrhacid",
      "tags": [
        "masculine"
      ],
      "word": "schrikvogel"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "phorusrhacid",
      "tags": [
        "neuter"
      ],
      "word": "Terrorvogel"
    },
    {
      "code": "ko",
      "lang": "Korean",
      "roman": "gongposae",
      "sense": "phorusrhacid",
      "word": "공포새"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "phorusrhacid",
      "tags": [
        "feminine"
      ],
      "word": "ave do terror"
    }
  ],
  "word": "terror bird"
}