"back cross" meaning in English

{
  "forms": [
    {
      "form": "back crosses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "back cross (plural back crosses)",
      "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": "Juggling",
          "orig": "en:Juggling",
          "parents": [
            "Games",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A throw where the object is caught and then thrown from behind the back."
      ],
      "id": "en-back_cross-en-noun-39EO6wwv",
      "links": [
        [
          "juggling",
          "juggling#Noun"
        ]
      ],
      "raw_glosses": [
        "(juggling) A throw where the object is caught and then thrown from behind the back."
      ],
      "synonyms": [
        {
          "word": "back-cross"
        },
        {
          "word": "backcross"
        }
      ],
      "topics": [
        "arts",
        "hobbies",
        "juggling",
        "lifestyle",
        "performing-arts",
        "sports"
      ]
    }
  ],
  "word": "back cross"
}

{
  "forms": [
    {
      "form": "back crosses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "back cross (plural back crosses)",
      "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",
        "en:Juggling"
      ],
      "glosses": [
        "A throw where the object is caught and then thrown from behind the back."
      ],
      "links": [
        [
          "juggling",
          "juggling#Noun"
        ]
      ],
      "raw_glosses": [
        "(juggling) A throw where the object is caught and then thrown from behind the back."
      ],
      "topics": [
        "arts",
        "hobbies",
        "juggling",
        "lifestyle",
        "performing-arts",
        "sports"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "back-cross"
    },
    {
      "word": "backcross"
    }
  ],
  "word": "back cross"
}