damper

US /ˈdæm.pɚ/
UK /ˈdæm.pɚ/
"damper" picture
1.

a plate or valve for controlling the flow of air or smoke, especially in the flue of a fireplace or furnace

:
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Adjust the damper to control the airflow in the fireplace.
•
The furnace damper needs to be cleaned.
:
baffleregulatorvalve
2.

a person or thing that has a depressing, subduing, or inhibiting effect

:
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The bad news put a real damper on our celebration.
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His pessimistic attitude was a constant damper on the team's morale.
:
wet blanketkilljoybuzzkilldownerspoilsport
:
put a damper on