To be shocked or disheartened by a sudden setback, disappointment, or a harsh reality; to have one's hopes or enthusiasm dampened.
听到这个不幸的消息，他顿时觉得像被冷水浇头，所有的热情都消散了。
Hearing the unfortunate news, he immediately felt as if cold water had been poured over his head, and all his enthusiasm vanished.
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