pour/throw cold water on
US /pɔr/θroʊ koʊld ˈwɔtər ɑn/
UK /pɔr/θroʊ koʊld ˈwɔtər ɑn/

1.
冷水を浴びせる, やる気をなくさせる
to say or do something that discourages someone or makes them feel less enthusiastic about something
:
•
She was excited about her new business idea, but her parents poured cold water on it.
彼女は新しいビジネスアイデアに興奮していたが、両親はそれに冷水を浴びせた。
•
Don't throw cold water on his plans; he's really trying hard.
彼の計画に冷水を浴びせないでください。彼は本当に一生懸命やっています。