"I'll be bound" meaning in English

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      "expansion": "I'll be bound",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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      "categories": [],
      "examples": [
        {
          "text": "Where are those teenagers going at this time of night? Up to no good, I'll be bound!",
          "type": "example"
        }
      ],
      "glosses": [
        "I am certain (that something is true)"
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          "certain",
          "certain"
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  "word": "I'll be bound"
}

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      "expansion": "I'll be bound",
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  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
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      "examples": [
        {
          "ref": "2007 June 7, tightenit, “Installation of TMV Valve”, in Screwfix Community:",
          "text": "Well, I'll be bound!! Another example of following the rules and being undercut on pricing by those who don't follow the regs.",
          "type": "quote"
        },
        {
          "ref": "2015, Mary Monroe, Mama Ruby:",
          "text": "\"Well, I'll be bound,\" Ruby said with a dreamy sigh.",
          "type": "quote"
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      "glosses": [
        "An expression of surprise."
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        "(idiomatic) An expression of surprise."
      ],
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        {
          "sense": "expression of surprise",
          "word": "wow"
        }
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        "idiomatic"
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  "word": "I'll be bound"
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          "text": "Where are those teenagers going at this time of night? Up to no good, I'll be bound!",
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      ],
      "glosses": [
        "I am certain (that something is true)"
      ],
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          "certain",
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  "word": "I'll be bound"
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  "lang_code": "en",
  "pos": "intj",
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      "examples": [
        {
          "ref": "2007 June 7, tightenit, “Installation of TMV Valve”, in Screwfix Community:",
          "text": "Well, I'll be bound!! Another example of following the rules and being undercut on pricing by those who don't follow the regs.",
          "type": "quote"
        },
        {
          "ref": "2015, Mary Monroe, Mama Ruby:",
          "text": "\"Well, I'll be bound,\" Ruby said with a dreamy sigh.",
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      ],
      "glosses": [
        "An expression of surprise."
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        "(idiomatic) An expression of surprise."
      ],
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  "synonyms": [
    {
      "sense": "expression of surprise",
      "word": "wow"
    }
  ],
  "word": "I'll be bound"
}