"clock calm" meaning in English

{
  "forms": [
    {
      "form": "clock calms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "clock calm (plural clock calms)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "source": "w"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Nautical",
          "orig": "en:Nautical",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
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        }
      ],
      "glosses": [
        "The condition of a perfectly flat sea with no waves and no wind."
      ],
      "id": "en-clock_calm-en-noun-G2imBRW5",
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "flat",
          "flat"
        ],
        [
          "sea",
          "sea"
        ],
        [
          "wave",
          "wave"
        ],
        [
          "wind",
          "wind"
        ]
      ],
      "raw_glosses": [
        "(nautical) The condition of a perfectly flat sea with no waves and no wind."
      ],
      "synonyms": [
        {
          "word": "dead calm"
        }
      ],
      "topics": [
        "nautical",
        "transport"
      ]
    }
  ],
  "word": "clock calm"
}

{
  "forms": [
    {
      "form": "clock calms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "clock calm (plural clock calms)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English entries with incorrect language header",
        "English lemmas",
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        "en:Nautical"
      ],
      "glosses": [
        "The condition of a perfectly flat sea with no waves and no wind."
      ],
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "flat",
          "flat"
        ],
        [
          "sea",
          "sea"
        ],
        [
          "wave",
          "wave"
        ],
        [
          "wind",
          "wind"
        ]
      ],
      "raw_glosses": [
        "(nautical) The condition of a perfectly flat sea with no waves and no wind."
      ],
      "synonyms": [
        {
          "word": "dead calm"
        }
      ],
      "topics": [
        "nautical",
        "transport"
      ]
    }
  ],
  "word": "clock calm"
}