"tree shaking" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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          "code": "fr",
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          "word": "tree shaking"
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        "tree shaking"
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  "word": "tree shaking"
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  "lang_code": "en",
  "pos": "noun",
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      "word": "tree shaking"
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  "word": "tree shaking"
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