"頭脳流出" meaning in Japanese

{
  "forms": [
    {
      "form": "頭脳流出",
      "ruby": [
        [
          "頭",
          "ず"
        ],
        [
          "脳",
          "のう"
        ],
        [
          "流",
          "りゅう"
        ],
        [
          "出",
          "しゅつ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "zunō ryūshutsu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "dunauriusyutu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "づなうりうしゆつ",
      "roman": "dunauriusyutu",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ずのう りゅうしゅつ",
        "head": "頭脳流出",
        "hhira": "づなうりうしゆつ"
      },
      "expansion": "頭(ず)脳(のう)流(りゅう)出(しゅつ) • (zunō ryūshutsu) ^(←づなうりうしゆつ (dunauriusyutu)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "brain drain"
      ],
      "id": "en-頭脳流出-ja-noun-V0rlnljx",
      "links": [
        [
          "brain drain",
          "brain drain"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "ずのーりゅうしゅつ"
    },
    {
      "ipa": "[d͡zɨᵝno̞ː ɾʲɨᵝːɕɨᵝt͡sɨᵝ]"
    }
  ],
  "word": "頭脳流出"
}

{
  "forms": [
    {
      "form": "頭脳流出",
      "ruby": [
        [
          "頭",
          "ず"
        ],
        [
          "脳",
          "のう"
        ],
        [
          "流",
          "りゅう"
        ],
        [
          "出",
          "しゅつ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "zunō ryūshutsu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "dunauriusyutu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "づなうりうしゆつ",
      "roman": "dunauriusyutu",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ずのう りゅうしゅつ",
        "head": "頭脳流出",
        "hhira": "づなうりうしゆつ"
      },
      "expansion": "頭(ず)脳(のう)流(りゅう)出(しゅつ) • (zunō ryūshutsu) ^(←づなうりうしゆつ (dunauriusyutu)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms historically spelled with づ",
        "Japanese terms spelled with first grade kanji",
        "Japanese terms spelled with second grade kanji",
        "Japanese terms spelled with sixth grade kanji",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with redundant sortkeys",
        "Japanese terms written with four Han script characters"
      ],
      "glosses": [
        "brain drain"
      ],
      "links": [
        [
          "brain drain",
          "brain drain"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "ずのーりゅうしゅつ"
    },
    {
      "ipa": "[d͡zɨᵝno̞ː ɾʲɨᵝːɕɨᵝt͡sɨᵝ]"
    }
  ],
  "word": "頭脳流出"
}