"backflop" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "back",
        "3": "flop"
      },
      "expansion": "back + flop",
      "name": "compound"
    }
  ],
  "etymology_text": "back + flop",
  "forms": [
    {
      "form": "backflops",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "backflop (plural backflops)",
      "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": "Diving",
          "orig": "en:Diving",
          "parents": [
            "Water sports",
            "Sports",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "bellyflop"
        },
        {
          "word": "cannonball"
        },
        {
          "word": "rip entry"
        }
      ],
      "glosses": [
        "A diving error that results in the diver's back making an impact on the surface of the water."
      ],
      "id": "en-backflop-en-noun-zXhmVHHL",
      "links": [
        [
          "diving",
          "diving"
        ]
      ],
      "synonyms": [
        {
          "word": "back flop"
        },
        {
          "word": "back-flop"
        }
      ]
    }
  ],
  "word": "backflop"
}

{
  "coordinate_terms": [
    {
      "word": "bellyflop"
    },
    {
      "word": "cannonball"
    },
    {
      "word": "rip entry"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "back",
        "3": "flop"
      },
      "expansion": "back + flop",
      "name": "compound"
    }
  ],
  "etymology_text": "back + flop",
  "forms": [
    {
      "form": "backflops",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "backflop (plural backflops)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "en:Diving"
      ],
      "glosses": [
        "A diving error that results in the diver's back making an impact on the surface of the water."
      ],
      "links": [
        [
          "diving",
          "diving"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "back flop"
    },
    {
      "word": "back-flop"
    }
  ],
  "word": "backflop"
}