"regression testing" meaning in English

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  "lang_code": "en",
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      "examples": [
        {
          "ref": "1999, Elfriede Dustin, Jeff Rashka, John Paul, Automated Software Testing, →ISBN:",
          "text": "During manual test execution, a newly introduced defect to previously working functionality might not be found until hours into the regression testing cycle.",
          "type": "quote"
        },
        {
          "ref": "2000, Robert V. Binder, Testing Object-oriented Systems: Models, Patterns, and Tools, →ISBN, page 32:",
          "text": "Without regression testing, unseen bugs will accumulate, until suddenly nothing works in what was once thought to be a stable system.",
          "type": "quote"
        },
        {
          "ref": "2004, Mark Last, Abraham Kandel, Horst Bunke, Artificial Intelligence Methods in Software Testing, →ISBN, page 52:",
          "text": "Regression testing can account for as much as one-half of the cost of software maintenance.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Testing a program after a modification to ensure that areas that should not be affected by the update behave as they did in previous versions."
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      "hypernyms": [
        {
          "word": "testing"
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        "(software engineering) Testing a program after a modification to ensure that areas that should not be affected by the update behave as they did in previous versions."
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  "word": "regression testing"
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          "ref": "1999, Elfriede Dustin, Jeff Rashka, John Paul, Automated Software Testing, →ISBN:",
          "text": "During manual test execution, a newly introduced defect to previously working functionality might not be found until hours into the regression testing cycle.",
          "type": "quote"
        },
        {
          "ref": "2000, Robert V. Binder, Testing Object-oriented Systems: Models, Patterns, and Tools, →ISBN, page 32:",
          "text": "Without regression testing, unseen bugs will accumulate, until suddenly nothing works in what was once thought to be a stable system.",
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        },
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          "ref": "2004, Mark Last, Abraham Kandel, Horst Bunke, Artificial Intelligence Methods in Software Testing, →ISBN, page 52:",
          "text": "Regression testing can account for as much as one-half of the cost of software maintenance.",
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        "Testing a program after a modification to ensure that areas that should not be affected by the update behave as they did in previous versions."
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        "(software engineering) Testing a program after a modification to ensure that areas that should not be affected by the update behave as they did in previous versions."
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