"tant mieux" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "fr",
        "3": "tant mieux"
      },
      "expansion": "French tant mieux",
      "name": "bor"
    }
  ],
  "etymology_text": "From French tant mieux.",
  "head_templates": [
    {
      "args": {
        "nolinkhead": "1"
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      "expansion": "tant mieux",
      "name": "en-interj"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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      ],
      "glosses": [
        "It's a good thing; so much the better; fortunately; used to express that a chance happening is favorable."
      ],
      "id": "en-tant_mieux-en-intj-Dm2KdD4G",
      "links": [
        [
          "so much the better",
          "so much the better"
        ],
        [
          "fortunately",
          "fortunately"
        ],
        [
          "favorable",
          "favorable#English"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/tɒn mjɜː/"
    }
  ],
  "word": "tant mieux"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "fr",
        "3": "tant mieux"
      },
      "expansion": "French tant mieux",
      "name": "bor"
    }
  ],
  "etymology_text": "From French tant mieux.",
  "head_templates": [
    {
      "args": {
        "nolinkhead": "1"
      },
      "expansion": "tant mieux",
      "name": "en-interj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English interjections",
        "English lemmas",
        "English multiword terms",
        "English terms borrowed from French",
        "English terms derived from French",
        "English terms with IPA pronunciation"
      ],
      "glosses": [
        "It's a good thing; so much the better; fortunately; used to express that a chance happening is favorable."
      ],
      "links": [
        [
          "so much the better",
          "so much the better"
        ],
        [
          "fortunately",
          "fortunately"
        ],
        [
          "favorable",
          "favorable#English"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/tɒn mjɜː/"
    }
  ],
  "word": "tant mieux"
}