"nerf ball" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "nerf",
        "3": "ball"
      },
      "expansion": "nerf + ball",
      "name": "com"
    }
  ],
  "etymology_text": "From nerf + ball.",
  "forms": [
    {
      "form": "nerf balls",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "nerf ball (plural nerf balls)",
      "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"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Getting hit by a nerf ball doesn't hurt at all.",
          "type": "example"
        }
      ],
      "glosses": [
        "Any small foam ball, soft and very light, designed for indoor use."
      ],
      "id": "en-nerf_ball-en-noun-KYJE9PHl",
      "links": [
        [
          "foam",
          "foam"
        ],
        [
          "ball",
          "ball"
        ]
      ]
    }
  ],
  "word": "nerf ball"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "nerf",
        "3": "ball"
      },
      "expansion": "nerf + ball",
      "name": "com"
    }
  ],
  "etymology_text": "From nerf + ball.",
  "forms": [
    {
      "form": "nerf balls",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "nerf ball (plural nerf balls)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound nouns",
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "Getting hit by a nerf ball doesn't hurt at all.",
          "type": "example"
        }
      ],
      "glosses": [
        "Any small foam ball, soft and very light, designed for indoor use."
      ],
      "links": [
        [
          "foam",
          "foam"
        ],
        [
          "ball",
          "ball"
        ]
      ]
    }
  ],
  "word": "nerf ball"
}