"flutter tongue" meaning in English

{
  "forms": [
    {
      "form": "flutter tongues",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "flutter tonguing",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "flutter tongued",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "flutter tongued",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "flutter tongue (third-person singular simple present flutter tongues, present participle flutter tonguing, simple past and past participle flutter tongued)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "word": "flutter-tongue"
        }
      ],
      "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"
        }
      ],
      "glosses": [
        "Alternative spelling of flutter-tongue."
      ],
      "id": "en-flutter_tongue-en-verb-e~czUe0~",
      "links": [
        [
          "flutter-tongue",
          "flutter-tongue#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "flutter tongue"
}

{
  "forms": [
    {
      "form": "flutter tongues",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "flutter tonguing",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "flutter tongued",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "flutter tongued",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "flutter tongue (third-person singular simple present flutter tongues, present participle flutter tonguing, simple past and past participle flutter tongued)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "word": "flutter-tongue"
        }
      ],
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Alternative spelling of flutter-tongue."
      ],
      "links": [
        [
          "flutter-tongue",
          "flutter-tongue#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "flutter tongue"
}