Definition of Pyrrhic victory noun from the Oxford Advanced American Dictionary

 

Pyrrhic victory

 noun
noun
NAmE//ˌpɪrɪk ˈvɪktəri//
 
 
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a victory that is not worth winning because the winner has suffered or lost so much in winning it From Pyrrhus, the king of Epirus, who defeated the Romans in 279 B.C.E. but lost many of his own men.
See the Oxford Advanced Learner's Dictionary entry: Pyrrhic victory