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
get to the bottom of (something)
to find out the real cause of something or answer to something
The government wants to get to the bottom of the financial problems in the company.