throw cold water on something

Từ điển tiếng Anh - Cambridge Advanced Learners Dictionary

▪ I. throw cold water on sth idiom
to be negative about someone's ideas or plans
• You're always throwing cold water on my suggestions.
Thesaurus⁺: ↑Discouraging and putting off
Main entry: throw_idiom
 
▪ II. pour/throw cold water on sth idiom
to criticize someone's opinions or ideas and stop people believing them or being excited about them
Thesaurus⁺: ↑Discouraging and putting off
Main entry: cold_idiom