lost cause

noun
🔊/ˌlɒst ˈkɔːz/
🔊/ˌlɔːst ˈkɔːz/
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  1. something that has failed or that cannot succeed业已失败的事情;没有希望的事情
    • The game looked a lost cause when the score reached 6–0.当比分达到6-0时,比赛看上去是失败的原因。
    Topics Difficulty and failurec2