survival by natural selection, sb who´s able to adapt well will survive
Unfortunately, he regarded the "survivalofthefittest" as a sort of guide for governmental policy, which often led him to oppose programs to assist the poor. Google
What in the devil did Darwin mean when he popularized the “survivalof thefittest” phrase? What he did not say is, perhaps, revealing. google
As though by common assent they fought, as though to determine once and for all their right to live, in accordance with the law of thesurvivalofthefittest. Google