1. something that reduces or restrains activity, enthusiasm, or enjoyment
2. a device that reduces vibration, sound, or oscillation
Usage: technical
3. a movable plate in a flue or chimney for controlling the draft

Examples

• The rain put a damper on our picnic plans.
• His negative attitude was a real damper on the party.
• The mechanic installed a new damper to reduce engine vibration.
• Close the damper when the fireplace is not in use.
• We cooked damper over the campfire during our outback trip.
• The stock market crash put a damper on consumer spending.
• The piano’s damper pedal controls the sustain of the notes.