"a thing or two" meaning in English

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  "lang_code": "en",
  "pos": "phrase",
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      "examples": [
        {
          "text": "He's a good mechanic, and surely knows a thing or two about car engines.",
          "type": "example"
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          "ref": "2021 September 22, Stephen Roberts, “The writings on the wall...”, in RAIL, number 940, page 75:",
          "text": "He [Winston Churchill] was born at Blenheim Palace, that Oxfordshire pile built for his ancestor John Churchill, 1st Duke of Marlborough, who also knew a thing or two about warfare.",
          "type": "quote"
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          "ref": "2022 November 16, Christian Wolmar, “Can Merriman use his rail knowledge to make a difference?”, in RAIL, number 970, page 44:",
          "text": "The good news is that the new Rail Minister is Huw Merriman, former Chairman of the House of Commons Transport Select Committee, which means he knows a thing or two about the railways.",
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      "glosses": [
        "A considerable amount; a lot."
      ],
      "id": "en-a_thing_or_two-en-phrase-sEB8Ej~r",
      "links": [
        [
          "a lot",
          "a lot"
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      "synonyms": [
        {
          "word": "a lot"
        },
        {
          "word": "loads"
        },
        {
          "word": "tons"
        },
        {
          "word": "a great deal"
        }
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "hěnduō",
          "sense": "considerable amount",
          "word": "很多"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "considerable amount",
          "word": "jotakin"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "considerable amount",
          "word": "eine ganze Menge"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "considerable amount",
          "tags": [
            "neuter"
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          "word": "coś niecoś"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "kóje-što",
          "sense": "considerable amount",
          "word": "ко́е-что"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "considerable amount",
          "word": "un rato"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "considerable amount",
          "word": "un rato largo"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "considerable amount",
          "word": "ett och annat"
        }
      ]
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  "word": "a thing or two"
}

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        },
        {
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          "text": "He [Winston Churchill] was born at Blenheim Palace, that Oxfordshire pile built for his ancestor John Churchill, 1st Duke of Marlborough, who also knew a thing or two about warfare.",
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      "glosses": [
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  "synonyms": [
    {
      "word": "a lot"
    },
    {
      "word": "loads"
    },
    {
      "word": "tons"
    },
    {
      "word": "a great deal"
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "hěnduō",
      "sense": "considerable amount",
      "word": "很多"
    },
    {
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      "lang": "Finnish",
      "sense": "considerable amount",
      "word": "jotakin"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "considerable amount",
      "word": "eine ganze Menge"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "considerable amount",
      "tags": [
        "neuter"
      ],
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    },
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      "lang": "Russian",
      "roman": "kóje-što",
      "sense": "considerable amount",
      "word": "ко́е-что"
    },
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      "code": "es",
      "lang": "Spanish",
      "sense": "considerable amount",
      "word": "un rato"
    },
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      "code": "es",
      "lang": "Spanish",
      "sense": "considerable amount",
      "word": "un rato largo"
    },
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      "lang": "Swedish",
      "sense": "considerable amount",
      "word": "ett och annat"
    }
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  "word": "a thing or two"
}