"in nothing flat" meaning in English

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      "expansion": "in nothing flat",
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  "lang_code": "en",
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      "examples": [
        {
          "text": "After so many years of practice, she can often find the problem and fix it in nothing flat.",
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      ],
      "glosses": [
        "A very short (but unspecified) amount of time; no time at all."
      ],
      "id": "en-in_nothing_flat-en-prep_phrase-s~On1-bM",
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          "time",
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      "raw_glosses": [
        "(idiomatic) A very short (but unspecified) amount of time; no time at all."
      ],
      "synonyms": [
        {
          "word": "in no time"
        },
        {
          "word": "in no time flat"
        }
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      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "very short amount of time",
          "word": "en un rien de temps"
        },
        {
          "code": "ja",
          "lang": "Japanese",
          "roman": "attoiuma",
          "sense": "very short amount of time",
          "word": "あっと言う間"
        },
        {
          "code": "ro",
          "lang": "Romanian",
          "sense": "very short amount of time",
          "word": "într-o clipă"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "v dva sčóta",
          "sense": "very short amount of time",
          "word": "в два счёта"
        }
      ]
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  "word": "in nothing flat"
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      "glosses": [
        "A very short (but unspecified) amount of time; no time at all."
      ],
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        "(idiomatic) A very short (but unspecified) amount of time; no time at all."
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  "synonyms": [
    {
      "word": "in no time"
    },
    {
      "word": "in no time flat"
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  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "very short amount of time",
      "word": "en un rien de temps"
    },
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "attoiuma",
      "sense": "very short amount of time",
      "word": "あっと言う間"
    },
    {
      "code": "ro",
      "lang": "Romanian",
      "sense": "very short amount of time",
      "word": "într-o clipă"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "v dva sčóta",
      "sense": "very short amount of time",
      "word": "в два счёта"
    }
  ],
  "word": "in nothing flat"
}