"lackaday" meaning in English

{
  "etymology_text": "Univerbation with apheresis from the interjection \"alack the day\".",
  "head_templates": [
    {
      "args": {},
      "expansion": "lackaday",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "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"
        }
      ],
      "glosses": [
        "An expression of regret or grief."
      ],
      "id": "en-lackaday-en-intj-NCCeCl~Q",
      "links": [
        [
          "regret",
          "regret#English"
        ],
        [
          "grief",
          "grief#English"
        ]
      ],
      "raw_glosses": [
        "(dated) An expression of regret or grief."
      ],
      "related": [
        {
          "word": "lackadaisical"
        },
        {
          "word": "lackadaisy"
        }
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "word": "lackaday"
}

{
  "etymology_text": "Univerbation with apheresis from the interjection \"alack the day\".",
  "head_templates": [
    {
      "args": {},
      "expansion": "lackaday",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "related": [
    {
      "word": "lackadaisical"
    },
    {
      "word": "lackadaisy"
    }
  ],
  "senses": [
    {
      "categories": [
        "English dated terms",
        "English entries with incorrect language header",
        "English interjections",
        "English lemmas",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "An expression of regret or grief."
      ],
      "links": [
        [
          "regret",
          "regret#English"
        ],
        [
          "grief",
          "grief#English"
        ]
      ],
      "raw_glosses": [
        "(dated) An expression of regret or grief."
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "word": "lackaday"
}