"rocker board" meaning in English

{
  "forms": [
    {
      "form": "rocker boards",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rocker board (plural rocker boards)",
      "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": "Exercise equipment",
          "orig": "en:Exercise equipment",
          "parents": [
            "Exercise",
            "Tools",
            "Sports",
            "Technology",
            "Human activity",
            "All topics",
            "Human behaviour",
            "Fundamental",
            "Human"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An item of exercising equipment which challenges the sportsman to balance his weight on it in one axis in which it could tilt."
      ],
      "id": "en-rocker_board-en-noun-zO6b277E",
      "links": [
        [
          "exercising",
          "exercise"
        ],
        [
          "equipment",
          "equipment"
        ],
        [
          "sportsman",
          "sportsman"
        ],
        [
          "balance",
          "balance"
        ],
        [
          "weight",
          "weight"
        ],
        [
          "axis",
          "axis"
        ],
        [
          "tilt",
          "tilt"
        ]
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "exercising equipment",
          "word": "tasapainolauta"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "exercising equipment",
          "tags": [
            "common-gender"
          ],
          "word": "vippbräda"
        }
      ]
    }
  ],
  "word": "rocker board"
}

{
  "forms": [
    {
      "form": "rocker boards",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rocker board (plural rocker boards)",
      "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:Exercise equipment"
      ],
      "glosses": [
        "An item of exercising equipment which challenges the sportsman to balance his weight on it in one axis in which it could tilt."
      ],
      "links": [
        [
          "exercising",
          "exercise"
        ],
        [
          "equipment",
          "equipment"
        ],
        [
          "sportsman",
          "sportsman"
        ],
        [
          "balance",
          "balance"
        ],
        [
          "weight",
          "weight"
        ],
        [
          "axis",
          "axis"
        ],
        [
          "tilt",
          "tilt"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "exercising equipment",
      "word": "tasapainolauta"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "exercising equipment",
      "tags": [
        "common-gender"
      ],
      "word": "vippbräda"
    }
  ],
  "word": "rocker board"
}