noun
survival of the fittest
A yojijukugo (four-character compound) expressing the idea that the strong win and the weak lose, often used in contexts of competition, evolution, or social Darwinism.
自然界では優勝劣敗が厳然と存在する。
In nature, survival of the fittest exists undeniably.
ビジネスの世界は優勝劣敗の厳しい競争だ。
The business world is a harsh competition of survival of the fittest.