"blind bit" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "!"
      },
      "expansion": "blind bit (plural not attested)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "parents": [
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          "name": "English negative polarity items",
          "parents": [
            "Negative polarity items",
            "Terms by semantic function"
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          "kind": "other",
          "name": "English nouns with unattested plurals",
          "parents": [
            "Nouns with unattested plurals",
            "Nouns",
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          "parents": [
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            "Entry maintenance"
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          "source": "w"
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      ],
      "examples": [
        {
          "text": "not to take a blind bit of notice",
          "type": "example"
        },
        {
          "text": "not to make a blind bit of difference",
          "type": "example"
        }
      ],
      "glosses": [
        "The slightest bit; any amount at all."
      ],
      "id": "en-blind_bit-en-noun-U~LZ2BPU",
      "raw_glosses": [
        "(UK, informal) The slightest bit; any amount at all."
      ],
      "tags": [
        "UK",
        "informal",
        "no-plural"
      ]
    }
  ],
  "word": "blind bit"
}

{
  "head_templates": [
    {
      "args": {
        "1": "!"
      },
      "expansion": "blind bit (plural not attested)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
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        "English lemmas",
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        "English nouns",
        "English nouns with unattested plurals",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "not to take a blind bit of notice",
          "type": "example"
        },
        {
          "text": "not to make a blind bit of difference",
          "type": "example"
        }
      ],
      "glosses": [
        "The slightest bit; any amount at all."
      ],
      "raw_glosses": [
        "(UK, informal) The slightest bit; any amount at all."
      ],
      "tags": [
        "UK",
        "informal",
        "no-plural"
      ]
    }
  ],
  "word": "blind bit"
}