"like a charm" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "like a charm",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "like a charm",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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      ],
      "examples": [
        {
          "text": "The sales pitch worked like a charm.",
          "type": "example"
        },
        {
          "ref": "2004, Joseph Rocco Cervasio, Bad News on the Doorstep: Inspired by a True Story, page 121:",
          "text": "The Chevy drove like a charm, even with a couple inches of snow on the roads.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Very effectively."
      ],
      "id": "en-like_a_charm-en-prep_phrase-EhoFyciA",
      "synonyms": [
        {
          "word": "a treat"
        },
        {
          "word": "like a dream"
        },
        {
          "word": "like magic"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-like a charm.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/a/a6/En-au-like_a_charm.ogg/En-au-like_a_charm.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/a/a6/En-au-like_a_charm.ogg"
    }
  ],
  "word": "like a charm"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "like a charm",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "like a charm",
      "name": "en-PP"
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  "lang_code": "en",
  "pos": "prep_phrase",
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        "English prepositional phrases",
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        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "text": "The sales pitch worked like a charm.",
          "type": "example"
        },
        {
          "ref": "2004, Joseph Rocco Cervasio, Bad News on the Doorstep: Inspired by a True Story, page 121:",
          "text": "The Chevy drove like a charm, even with a couple inches of snow on the roads.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Very effectively."
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-like a charm.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/a/a6/En-au-like_a_charm.ogg/En-au-like_a_charm.ogg.mp3",
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  ],
  "synonyms": [
    {
      "word": "a treat"
    },
    {
      "word": "like a dream"
    },
    {
      "word": "like magic"
    }
  ],
  "word": "like a charm"
}