"front crawl" meaning in English

{
  "forms": [
    {
      "form": "front crawls",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "front crawl (plural front crawls)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Swimming",
          "orig": "en:Swimming",
          "parents": [
            "Water sports",
            "Sports",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A style of swimming where the swimmer is face-down in the water and moves the arms in alternating overhead strokes."
      ],
      "id": "en-front_crawl-en-noun-pmprOLSC",
      "links": [
        [
          "swimming",
          "swimming"
        ]
      ],
      "synonyms": [
        {
          "word": "American crawl"
        },
        {
          "word": "Australian crawl"
        },
        {
          "word": "crawl"
        },
        {
          "word": "freestyle"
        }
      ],
      "wikipedia": [
        "front crawl"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌfɹʌntˈkɹɑːl/"
    }
  ],
  "word": "front crawl"
}

{
  "forms": [
    {
      "form": "front crawls",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "front crawl (plural front crawls)",
      "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",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Swimming"
      ],
      "glosses": [
        "A style of swimming where the swimmer is face-down in the water and moves the arms in alternating overhead strokes."
      ],
      "links": [
        [
          "swimming",
          "swimming"
        ]
      ],
      "wikipedia": [
        "front crawl"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌfɹʌntˈkɹɑːl/"
    }
  ],
  "synonyms": [
    {
      "word": "American crawl"
    },
    {
      "word": "Australian crawl"
    },
    {
      "word": "crawl"
    },
    {
      "word": "freestyle"
    }
  ],
  "word": "front crawl"
}