n.
1.a movable iron plate that regulates the draft in a stove or chimney or furnace
2.a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations
3.a depressing restraint
Idiom of the Day
birds-eye view
a view from high above, a brief look at something
We had a birds-eye view of the playing field from our seats high up in the stadium.