"hạ thế" meaning in Vietnamese

{
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        "1": "下勢"
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      "expansion": "Sino-Vietnamese word from 下勢",
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  "etymology_text": "Sino-Vietnamese word from 下勢.",
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      "expansion": "hạ thế",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "hạ thế",
      "name": "vi-noun"
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  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "Sino-Vietnamese words",
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          "source": "w"
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        {
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          "name": "Vietnamese nouns without classifiers",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "Physics",
          "orig": "vi:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "low voltage"
      ],
      "id": "en-hạ_thế-vi-noun-8jTb9NSs",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "low",
          "low"
        ],
        [
          "voltage",
          "voltage"
        ]
      ],
      "raw_glosses": [
        "(physics) low voltage"
      ],
      "related": [
        {
          "word": "cao thế"
        },
        {
          "word": "trung thế"
        },
        {
          "word": "điện thế"
        }
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "vi:hạ thế"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[haː˧˨ʔ tʰe˧˦]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[haː˨˩ʔ tʰej˨˩˦]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[haː˨˩˨ tʰej˦˥]",
      "note": "Saigon"
    }
  ],
  "word": "hạ thế"
}

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  "etymology_text": "Sino-Vietnamese word from 下勢.",
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      "expansion": "hạ thế",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "hạ thế",
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  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "related": [
    {
      "word": "cao thế"
    },
    {
      "word": "trung thế"
    },
    {
      "word": "điện thế"
    }
  ],
  "senses": [
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        "Vietnamese nouns without classifiers",
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        "vi:Physics"
      ],
      "glosses": [
        "low voltage"
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "low",
          "low"
        ],
        [
          "voltage",
          "voltage"
        ]
      ],
      "raw_glosses": [
        "(physics) low voltage"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "vi:hạ thế"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[haː˧˨ʔ tʰe˧˦]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[haː˨˩ʔ tʰej˨˩˦]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[haː˨˩˨ tʰej˦˥]",
      "note": "Saigon"
    }
  ],
  "word": "hạ thế"
}