"chest expander" meaning in English

{
  "forms": [
    {
      "form": "chest expanders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chest expander (plural chest expanders)",
      "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"
        }
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      "examples": [
        {
          "ref": "1982, Douglas Adams, Life, the Universe and Everything, page 62",
          "text": "He held his breath, and congratulated himself on having lain in bed sulking for the last few days rather than trying to work out his feelings on the chest expanders in the ship's gym.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An exercise device consisting of two handles joined by steel springs, used to develop the muscles of the chest."
      ],
      "id": "en-chest_expander-en-noun-ikArxHCX"
    }
  ],
  "word": "chest expander"
}

{
  "forms": [
    {
      "form": "chest expanders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chest expander (plural chest expanders)",
      "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",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1982, Douglas Adams, Life, the Universe and Everything, page 62",
          "text": "He held his breath, and congratulated himself on having lain in bed sulking for the last few days rather than trying to work out his feelings on the chest expanders in the ship's gym.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An exercise device consisting of two handles joined by steel springs, used to develop the muscles of the chest."
      ]
    }
  ],
  "word": "chest expander"
}