"heavy icebreaker" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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      "coordinate_terms": [
        {
          "word": "icebreaker"
        },
        {
          "word": "light icebreaker"
        },
        {
          "word": "medium icebreaker"
        },
        {
          "word": "slushbreaker"
        }
      ],
      "glosses": [
        "An icebreaking ship capable of all-year, overwinter operations in polar regions, through multi-year ice."
      ],
      "id": "en-heavy_icebreaker-en-noun-q1~OaZBU"
    }
  ],
  "word": "heavy icebreaker"
}

{
  "coordinate_terms": [
    {
      "word": "icebreaker"
    },
    {
      "word": "light icebreaker"
    },
    {
      "word": "medium icebreaker"
    },
    {
      "word": "slushbreaker"
    }
  ],
  "forms": [
    {
      "form": "heavy icebreakers",
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        "plural"
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      "expansion": "heavy icebreaker (plural heavy icebreakers)",
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  "lang_code": "en",
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      "glosses": [
        "An icebreaking ship capable of all-year, overwinter operations in polar regions, through multi-year ice."
      ]
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  "word": "heavy icebreaker"
}