"defensive halfback" meaning in English

{
  "forms": [
    {
      "form": "defensive halfbacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "defensive halfback (plural defensive halfbacks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
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          "kind": "other",
          "name": "Pages with 1 entry",
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          "kind": "other",
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        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Canadian football",
          "orig": "en:Canadian football",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A defensive back whose primary jobs are to cover the slotback on passing plays and prevent running plays from going to the outside."
      ],
      "id": "en-defensive_halfback-en-noun-RRPOVEyj",
      "links": [
        [
          "Canadian football",
          "Canadian football"
        ],
        [
          "defensive back",
          "defensive back"
        ],
        [
          "slotback",
          "slotback"
        ]
      ],
      "raw_glosses": [
        "(Canadian football) A defensive back whose primary jobs are to cover the slotback on passing plays and prevent running plays from going to the outside."
      ],
      "tags": [
        "Canadian"
      ],
      "topics": [
        "ball-games",
        "football",
        "games",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "word": "defensive halfback"
}

{
  "forms": [
    {
      "form": "defensive halfbacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "defensive halfback (plural defensive halfbacks)",
      "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",
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        "en:Canadian football"
      ],
      "glosses": [
        "A defensive back whose primary jobs are to cover the slotback on passing plays and prevent running plays from going to the outside."
      ],
      "links": [
        [
          "Canadian football",
          "Canadian football"
        ],
        [
          "defensive back",
          "defensive back"
        ],
        [
          "slotback",
          "slotback"
        ]
      ],
      "raw_glosses": [
        "(Canadian football) A defensive back whose primary jobs are to cover the slotback on passing plays and prevent running plays from going to the outside."
      ],
      "tags": [
        "Canadian"
      ],
      "topics": [
        "ball-games",
        "football",
        "games",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "word": "defensive halfback"
}