"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": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Birds",
          "orig": "en:Birds",
          "parents": [
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "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"
        }
      ],
      "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 entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "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"
    }
  ],
  "word": "terror bird"
}