"back five" meaning in English

{
  "forms": [
    {
      "form": "back fives",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "back five (plural back fives)",
      "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": "topical",
          "langcode": "en",
          "name": "Rugby union",
          "orig": "en:Rugby union",
          "parents": [
            "Rugby",
            "Ball games",
            "Sports",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2011 February 4, Gareth Roberts, “Wales 19-26 England”, in BBC",
          "text": "Wales chose to bring their back-five into the game early on with Andy Powell, Sam Warburton, Dan Lydiate and Bradley Davies making inroads into the England defence.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Collectively, the backs (the 2 wings, fullback, outside centre and inside centre)."
      ],
      "id": "en-back_five-en-noun-NY9A7wQC",
      "links": [
        [
          "rugby union",
          "rugby union"
        ],
        [
          "back",
          "back"
        ],
        [
          "wing",
          "wing"
        ],
        [
          "fullback",
          "fullback"
        ],
        [
          "outside centre",
          "outside centre"
        ],
        [
          "inside centre",
          "inside centre"
        ]
      ],
      "qualifier": "rugby union",
      "raw_glosses": [
        "(rugby union) Collectively, the backs (the 2 wings, fullback, outside centre and inside centre)."
      ],
      "synonyms": [
        {
          "word": "back-five"
        }
      ]
    }
  ],
  "word": "back five"
}

{
  "forms": [
    {
      "form": "back fives",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "back five (plural back fives)",
      "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",
        "en:Rugby union"
      ],
      "examples": [
        {
          "ref": "2011 February 4, Gareth Roberts, “Wales 19-26 England”, in BBC",
          "text": "Wales chose to bring their back-five into the game early on with Andy Powell, Sam Warburton, Dan Lydiate and Bradley Davies making inroads into the England defence.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Collectively, the backs (the 2 wings, fullback, outside centre and inside centre)."
      ],
      "links": [
        [
          "rugby union",
          "rugby union"
        ],
        [
          "back",
          "back"
        ],
        [
          "wing",
          "wing"
        ],
        [
          "fullback",
          "fullback"
        ],
        [
          "outside centre",
          "outside centre"
        ],
        [
          "inside centre",
          "inside centre"
        ]
      ],
      "qualifier": "rugby union",
      "raw_glosses": [
        "(rugby union) Collectively, the backs (the 2 wings, fullback, outside centre and inside centre)."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "back-five"
    }
  ],
  "word": "back five"
}