"downhill creep" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "The slow downward progression of rock and soil down a low-grade slope."
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      "raw_glosses": [
        "(geomorphology) The slow downward progression of rock and soil down a low-grade slope."
      ],
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        {
          "word": "terracette"
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  "lang_code": "en",
  "pos": "noun",
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        "The slow downward progression of rock and soil down a low-grade slope."
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        "(geomorphology) The slow downward progression of rock and soil down a low-grade slope."
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