Pyrrhic victory
noun [ C usually singular ] uk/ˌpɪr.ɪk ˈvɪk.tər.i/ us/ˌpɪr.ɪk ˈvɪk.tɚ.i/
以极大代价换取的胜利，得不偿失的胜利
a victory that is not worth winning because the winner has lost so much in winning it
She won the court case, but it was a Pyrrhic victory because she had to pay so much in legal fees. 她赢了这场官司，但得不偿失，因为她得支付高额诉讼费。