The law of the jungle: a situation in which the strong prey on the weak; the weak become victims of the strong. Often used metaphorically for harsh competition.
自然界では弱肉強食の原理がしばしば見られる。
In nature, the principle of the law of the jungle is often seen.
現代のビジネス社会は弱肉強食だと言う人もいる。
Some people say that modern business society is a law-of-the-jungle world.
弱肉強食の社会で生き残るためには柔軟な対応が必要だ。
To survive in a cutthroat (law-of-the-jungle) society you need to adapt flexibly.