That which damps or checks; as:
- One that deadens, restrains, or depresses: Rain put a damper on our picnic plans.
- An adjustable plate, as in the flue of a furnace or stove, for controlling the draft.
- Music A device in various keyboard instruments for deadening the vibrations of the strings.
- Music A mute for various brass instruments.
- A device that eliminates or progressively diminishes vibrations or oscillations, as of a magnetic needle.