"the half of it" meaning in English

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      "expansion": "the half of it",
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  "lang_code": "en",
  "pos": "phrase",
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          "text": "A: I think something's up with So-and-So. He's been acting a little weird lately.\nB: You don't know the half of it!",
          "type": "example"
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      ],
      "glosses": [
        "Only a part of something; not the full picture. Typically it is implied to be the most important part."
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      "id": "en-the_half_of_it-en-phrase-4voslXoP",
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      "raw_glosses": [
        "(idiomatic, informal, chiefly in the negative) Only a part of something; not the full picture. Typically it is implied to be the most important part."
      ],
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        "in the negative"
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      "tags": [
        "idiomatic",
        "informal"
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      "translations": [
        {
          "code": "it",
          "lang": "Italian",
          "sense": "only a part of something",
          "tags": [
            "feminine"
          ],
          "word": "una parte della storia"
        }
      ]
    }
  ],
  "word": "the half of it"
}

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      "expansion": "the half of it",
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          "text": "A: I think something's up with So-and-So. He's been acting a little weird lately.\nB: You don't know the half of it!",
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      ],
      "glosses": [
        "Only a part of something; not the full picture. Typically it is implied to be the most important part."
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        "(idiomatic, informal, chiefly in the negative) Only a part of something; not the full picture. Typically it is implied to be the most important part."
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        "in the negative"
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  "translations": [
    {
      "code": "it",
      "lang": "Italian",
      "sense": "only a part of something",
      "tags": [
        "feminine"
      ],
      "word": "una parte della storia"
    }
  ],
  "word": "the half of it"
}