"Decoration Day" meaning in English

{
  "etymology_text": "So called from the practice of decorating the military graves with flowers.",
  "head_templates": [
    {
      "args": {
        "1": "?",
        "head": "Decoration Day"
      },
      "expansion": "Decoration Day",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "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"
        }
      ],
      "examples": [
        {
          "ref": "2023, Colson Whitehead, Crook Manifesto, Fleet, page 16:",
          "text": "When Carney heard they were renaming Decoration Day and moving it from May 30th to the last Monday in May, he hadn’t seen the point.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Memorial Day."
      ],
      "id": "en-Decoration_Day-en-noun-v9uxSmT1",
      "links": [
        [
          "Memorial Day",
          "Memorial Day"
        ]
      ],
      "raw_glosses": [
        "(US, dated) Memorial Day."
      ],
      "tags": [
        "US",
        "dated"
      ]
    }
  ],
  "word": "Decoration Day"
}

{
  "etymology_text": "So called from the practice of decorating the military graves with flowers.",
  "head_templates": [
    {
      "args": {
        "1": "?",
        "head": "Decoration Day"
      },
      "expansion": "Decoration Day",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English dated terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "2023, Colson Whitehead, Crook Manifesto, Fleet, page 16:",
          "text": "When Carney heard they were renaming Decoration Day and moving it from May 30th to the last Monday in May, he hadn’t seen the point.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Memorial Day."
      ],
      "links": [
        [
          "Memorial Day",
          "Memorial Day"
        ]
      ],
      "raw_glosses": [
        "(US, dated) Memorial Day."
      ],
      "tags": [
        "US",
        "dated"
      ]
    }
  ],
  "word": "Decoration Day"
}