| a victory or goal achieved at too great a cost. |

A victory that is accompanied by enormous losses and leaves the winners in as desperate shape as if they had lost. Pyrrhus was an ancient general who, after defeating the Romans, told those who wished to congratulate him, “One more such victory and Pyrrhus is undone.”
Pyrrhic Victory
A victory or success that comes at the expense of great losses or costs. In business, examples of such a victory could be succeeding at a hostile takeover bid or winning a lengthy and expensive lawsuit.
Investopedia Commentary
In 2001, Microsoft won a Pyrrhic victory in its antitrust case when the Appeals Court decided the software giant was not to be broken up. However, Microsoft was still branded a monopoly and was subject to other punishment.
The expression alludes to the Greek King Pyrrhus who, after defeating the Romans in battle, stated: "If we win another such battle against the Romans, we will be completely lost."
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Pyrrhic victory
A victory that is offset by staggering losses, as in The campaign was so divisive that even though he won the election it was a Pyrrhic victory. This expression alludes to Kind Pyrrhus of Epirus, who defeated the Romans at Asculum in a.d. 279, but lost his best officers and many of his troops. Pyrrhus then said: "Another such victory and we are lost." In English the term was first recorded (used figuratively) in 1879.