"and so say all of us" meaning in English

{
  "etymology_text": "Popularized by For He's a Jolly Good Fellow",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "and so say all of us",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1911, George Bernard Shaw, Fanny's First Play, Act III",
          "text": "MARGARET. Three cheers for old England! [She shakes hands with him warmly].\nBOBBY. Hurra-a-ay! And so say all of us.",
          "type": "quotation"
        },
        {
          "ref": "1981, John Rowe Townsend, The Islanders",
          "text": "'[a prayer][…]and keep us safe from sin on this blessed isle, and long may we live and prosper and be a credit to your name and memory. And so say all of us.'\n'And so say all of us!' echoed the congregation thankfully.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "amen (used to express strong agreement, or exultation after a prayer)"
      ],
      "id": "en-and_so_say_all_of_us-en-phrase-MruZQJnM",
      "links": [
        [
          "amen",
          "amen"
        ],
        [
          "exultation",
          "exultation#English"
        ]
      ],
      "wikipedia": [
        "For He's a Jolly Good Fellow"
      ]
    }
  ],
  "word": "and so say all of us"
}

{
  "etymology_text": "Popularized by For He's a Jolly Good Fellow",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "and so say all of us",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English phrases",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1911, George Bernard Shaw, Fanny's First Play, Act III",
          "text": "MARGARET. Three cheers for old England! [She shakes hands with him warmly].\nBOBBY. Hurra-a-ay! And so say all of us.",
          "type": "quotation"
        },
        {
          "ref": "1981, John Rowe Townsend, The Islanders",
          "text": "'[a prayer][…]and keep us safe from sin on this blessed isle, and long may we live and prosper and be a credit to your name and memory. And so say all of us.'\n'And so say all of us!' echoed the congregation thankfully.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "amen (used to express strong agreement, or exultation after a prayer)"
      ],
      "links": [
        [
          "amen",
          "amen"
        ],
        [
          "exultation",
          "exultation#English"
        ]
      ],
      "wikipedia": [
        "For He's a Jolly Good Fellow"
      ]
    }
  ],
  "word": "and so say all of us"
}