pyrrhic victory - definition and synonyms

noun [countable] 

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/ˌpɪrɪk ˈvɪkt(ə)ri/
singularpyrrhic victory
pluralpyrrhic victories
  1. a victory that is not worth winning because you lost a lot in order to achieve it
Word story
From the Greek king Pyrrhus, whose army defeated the Romans but at such great cost that he said another similar victory would destroy him.