"survival of the fittest" meaning in All languages combined

{
  "categories": [
    {
      "kind": "other",
      "name": "英語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "英語 成句",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "英語",
  "lang_code": "en",
  "pos": "phrase",
  "pos_title": "成句",
  "senses": [
    {
      "glosses": [
        "適者生存。"
      ],
      "id": "ja-survival_of_the_fittest-en-phrase-MszPvVLW"
    },
    {
      "glosses": [
        "弱肉強食。"
      ],
      "id": "ja-survival_of_the_fittest-en-phrase-Eb6hhfII"
    }
  ],
  "synonyms": [
    {
      "word": "natural selection"
    },
    {
      "word": "law of the jungle"
    }
  ],
  "tags": [
    "idiomatic"
  ],
  "word": "survival of the fittest"
}

{
  "categories": [
    "英語",
    "英語 terms with redundant head parameter",
    "英語 成句"
  ],
  "lang": "英語",
  "lang_code": "en",
  "pos": "phrase",
  "pos_title": "成句",
  "senses": [
    {
      "glosses": [
        "適者生存。"
      ]
    },
    {
      "glosses": [
        "弱肉強食。"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "natural selection"
    },
    {
      "word": "law of the jungle"
    }
  ],
  "tags": [
    "idiomatic"
  ],
  "word": "survival of the fittest"
}