rub salt in/into the wound idiom
伤口上撒盐，雪上加霜（使某一困难局势对某人变得更糟）
to make a difficult situation even worse for someone
Losing was bad enough. Watching them receiving the trophy just rubbed salt into the wound. 落败已经很糟糕了；还要看着他们接受奖杯，更是在伤口上撒盐。
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