"smooth as a baby's bottom" meaning in English

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      "expansion": "smooth as a baby's bottom (not comparable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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          "name": "Touch",
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            "Senses",
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      "examples": [
        {
          "ref": "2000, Moosewood Collective, New Recipes from Moosewood Restaurant, Ten Speed Press, →ISBN, page 284:",
          "text": "The texture has been described as being as soft and smooth as a baby's bottom",
          "type": "quote"
        },
        {
          "ref": "1993, Peter Robinson, A Necessary End, HarperCollins, →ISBN, page 316:",
          "text": "His cheeks were as smooth as a baby's bottom, and he smelled good.",
          "type": "quote"
        },
        {
          "ref": "2004, Stephanie H. Meyer with John Meyer, Teen Ink: Written in the Dirt--, HCI Teens, →ISBN, page 89:",
          "text": "He'd sanded it for hours, \"Until it was smooth as a baby's bottom,\" he'd said, and laughed his deep, throaty laugh.",
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        }
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        "Extremely smooth."
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          "smooth",
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        "(simile) Extremely smooth."
      ],
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        "not-comparable"
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      "translations": [
        {
          "code": "cs",
          "lang": "Czech",
          "sense": "very smooth",
          "word": "hladký jako dětská prdelka"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "very smooth",
          "word": "doux comme une peau de bébé"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "very smooth",
          "word": "weich wie ein Babypopo"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "very smooth",
          "word": "suave como el culito de un bebé"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "very smooth",
          "word": "len som en barnrumpa"
        }
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  "lang_code": "en",
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        {
          "ref": "2000, Moosewood Collective, New Recipes from Moosewood Restaurant, Ten Speed Press, →ISBN, page 284:",
          "text": "The texture has been described as being as soft and smooth as a baby's bottom",
          "type": "quote"
        },
        {
          "ref": "1993, Peter Robinson, A Necessary End, HarperCollins, →ISBN, page 316:",
          "text": "His cheeks were as smooth as a baby's bottom, and he smelled good.",
          "type": "quote"
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        {
          "ref": "2004, Stephanie H. Meyer with John Meyer, Teen Ink: Written in the Dirt--, HCI Teens, →ISBN, page 89:",
          "text": "He'd sanded it for hours, \"Until it was smooth as a baby's bottom,\" he'd said, and laughed his deep, throaty laugh.",
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        "Extremely smooth."
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          "smooth",
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        "(simile) Extremely smooth."
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  "translations": [
    {
      "code": "cs",
      "lang": "Czech",
      "sense": "very smooth",
      "word": "hladký jako dětská prdelka"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "very smooth",
      "word": "doux comme une peau de bébé"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "very smooth",
      "word": "weich wie ein Babypopo"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "very smooth",
      "word": "suave como el culito de un bebé"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "very smooth",
      "word": "len som en barnrumpa"
    }
  ],
  "word": "smooth as a baby's bottom"
}