"if memory serves" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "if memory serves",
      "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"
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          "source": "w"
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      "examples": [
        {
          "ref": "1954, The Accountant, volume 130, page xxxiii",
          "text": "But A. P. H. has told us how he has demonstrated, at least twice, that indeed a cheque need not be on paper. Once, if memory serves, he used a table napkin; on the other occasion it was the label of an almost empty wine bottle.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "If I have correctly remembered the details."
      ],
      "id": "en-if_memory_serves-en-phrase-dOhessBd",
      "synonyms": [
        {
          "word": "as memory serves"
        },
        {
          "word": "if memory serves right"
        }
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Translations",
          "word": "muistaakseni"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Translations",
          "word": "jos oikein muistan"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "Translations",
          "word": "si ma mémoire est bonne"
        },
        {
          "code": "de",
          "english": "but slightly elevated",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "idiomatic"
          ],
          "word": "wenn ich mich recht entsinne"
        },
        {
          "code": "de",
          "lang": "German",
          "note": "more informal",
          "sense": "Translations",
          "word": "wenn ich mich richtig erinnere"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "word": "wenn ich es richtig im Kopf habe"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "Translations",
          "word": "jeśli dobrze pamiętam"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "Translations",
          "word": "se a memória não me falha"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "Translations",
          "word": "se bem me lembro"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "jesli pamjatʹ ne izmenjajet",
          "sense": "Translations",
          "word": "если память не изменяет"
        },
        {
          "code": "gd",
          "lang": "Scottish Gaelic",
          "sense": "Translations",
          "word": "mas math mo chuimhne"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "Translations",
          "word": "si mal no me acuerdo"
        }
      ]
    }
  ],
  "word": "if memory serves"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
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      "expansion": "if memory serves",
      "name": "head"
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  ],
  "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",
        "Quotation templates to be cleaned",
        "Translation table header lacks gloss"
      ],
      "examples": [
        {
          "ref": "1954, The Accountant, volume 130, page xxxiii",
          "text": "But A. P. H. has told us how he has demonstrated, at least twice, that indeed a cheque need not be on paper. Once, if memory serves, he used a table napkin; on the other occasion it was the label of an almost empty wine bottle.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "If I have correctly remembered the details."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "as memory serves"
    },
    {
      "word": "if memory serves right"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Translations",
      "word": "muistaakseni"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Translations",
      "word": "jos oikein muistan"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "Translations",
      "word": "si ma mémoire est bonne"
    },
    {
      "code": "de",
      "english": "but slightly elevated",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "idiomatic"
      ],
      "word": "wenn ich mich recht entsinne"
    },
    {
      "code": "de",
      "lang": "German",
      "note": "more informal",
      "sense": "Translations",
      "word": "wenn ich mich richtig erinnere"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "word": "wenn ich es richtig im Kopf habe"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "Translations",
      "word": "jeśli dobrze pamiętam"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "Translations",
      "word": "se a memória não me falha"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "Translations",
      "word": "se bem me lembro"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "jesli pamjatʹ ne izmenjajet",
      "sense": "Translations",
      "word": "если память не изменяет"
    },
    {
      "code": "gd",
      "lang": "Scottish Gaelic",
      "sense": "Translations",
      "word": "mas math mo chuimhne"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "Translations",
      "word": "si mal no me acuerdo"
    }
  ],
  "word": "if memory serves"
}