"neck day" meaning in English

{
  "forms": [
    {
      "form": "neck days",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "neck day (plural neck days)",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "arm day"
        },
        {
          "word": "back day"
        },
        {
          "word": "brain day"
        },
        {
          "word": "cardio day"
        },
        {
          "word": "chest day"
        },
        {
          "word": "core day"
        },
        {
          "word": "full-body day"
        },
        {
          "word": "lower body day"
        },
        {
          "word": "rest day"
        },
        {
          "word": "total body day"
        },
        {
          "word": "upper body day"
        }
      ],
      "glosses": [
        "A day dedicated to neck exercises."
      ],
      "id": "en-neck_day-en-noun-R7avICJA",
      "links": [
        [
          "exercise",
          "exercise"
        ]
      ]
    }
  ],
  "word": "neck day"
}

{
  "coordinate_terms": [
    {
      "word": "arm day"
    },
    {
      "word": "back day"
    },
    {
      "word": "brain day"
    },
    {
      "word": "cardio day"
    },
    {
      "word": "chest day"
    },
    {
      "word": "core day"
    },
    {
      "word": "full-body day"
    },
    {
      "word": "lower body day"
    },
    {
      "word": "rest day"
    },
    {
      "word": "total body day"
    },
    {
      "word": "upper body day"
    }
  ],
  "forms": [
    {
      "form": "neck days",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "neck day (plural neck days)",
      "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",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A day dedicated to neck exercises."
      ],
      "links": [
        [
          "exercise",
          "exercise"
        ]
      ]
    }
  ],
  "word": "neck day"
}