Определение pyrrhic victory в Английский Язык Английский Язык словарь
A very costly victory, wherein the considerable losses outweigh the gain, so as to render the struggle not worth the cost
If you describe a victory as a Pyrrhic victory, you mean that although someone has won or gained something, they have also lost something which was worth even more. a victory in which the person who wins suffers so much that the victory was hardly worth winning (Pyrrhus (312?-272BC), Greek king whose army defeated the Romans but had very many killed and wounded)
victory accompanied by enormous losses (as was Pyrrhus' victory over the Romans in the 3rd century B.C.)