"leaf-turner" meaning in English

{
  "forms": [
    {
      "form": "leaf-turners",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "leaf-turner (plural leaf-turners)",
      "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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A device for turning the pages of sheet music while a musician is sight reading."
      ],
      "id": "en-leaf-turner-en-noun-QPm~n0tN",
      "links": [
        [
          "device",
          "device"
        ],
        [
          "page",
          "page"
        ],
        [
          "sheet music",
          "sheet music"
        ],
        [
          "sight reading",
          "sight reading"
        ]
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Translations",
          "word": "sivunkääntäjä"
        }
      ]
    }
  ],
  "word": "leaf-turner"
}

{
  "forms": [
    {
      "form": "leaf-turners",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "leaf-turner (plural leaf-turners)",
      "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",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Finnish translations",
        "Translation table header lacks gloss"
      ],
      "glosses": [
        "A device for turning the pages of sheet music while a musician is sight reading."
      ],
      "links": [
        [
          "device",
          "device"
        ],
        [
          "page",
          "page"
        ],
        [
          "sheet music",
          "sheet music"
        ],
        [
          "sight reading",
          "sight reading"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Translations",
      "word": "sivunkääntäjä"
    }
  ],
  "word": "leaf-turner"
}