Don't throw cold water on them.

不要向他们泼冷水。

youdao

I didn't mean to throw cold water on your plans.

我并不是有意给你的计划泼冷水。

youdao

Everybody else in the office think my idea is great, but my boss throw cold water on it.

办公室里所有人都认为我的主意很好，但我的老板给我泼冷水。

youdao

Roach says bank reserve requirements and rises in interest rates, combined with Beijing's recent "administrative edicts" to rein in investments, will throw cold water on the "China mania" gripping investors who blithely assume 11% growth every year.

FORBES: Magazine Article

It is not a surprise that Apple CEO Tim Cook paid a visit to China Mobile, but a statement from China Mobile appears to throw cold water on any immediate decision for China Mobile to carry iPhone.

FORBES: Tim Cook Calls On China Mobile, Raises Hope For iPhone Deal

Here to throw some cold water on the fiery Mr. Smith - uh, Mr. Walz, who's about to go to Washington.

NPR: Troop-Surge Opponents Mull Options