puts a damper on

Spoils the mood

To put a damper on something is to diminish its intensity or enthusiasm—to suppress or discourage: The rain put a damper on our picnic plans.

The phrase evokes a damper, a device that controls airflow in a fireplace or mutes the sound of a piano.

Something that puts a damper on a situation doesn't extinguish it entirely but subdues its energy or momentum.

Related

put a crimp in · overshadow · demoralize · bring down · impede · staves off · chill · cool one's jets · deflate · take the wind out · sadden · mute · throw cold water on · subdue · cloud · undermine · frustrate · disappoint

Opposites
effect on enthusiasm/mood

puts a damper onencourages

Promotes confidence in others

excites · fires up · enthuses · brightens · cheers up

effect on activity/momentum

puts a damper onfuels

Energy sources for engines

accelerates · propels · catalyzes · promotes · facilitates

Family

puts, putting, damper, damp, dampen, dampened, dampening, dampens, dampness

Familiarity
Top 100,000
Profile
Known to kids · Used worldwide · Timeless · Negative · Everyday, not technical · Rated G