1. Type of medium weight cotton
canvas cloth, specifically used for backdrops and covering flats. Heavier, but more durable than
muslin.
Also known as Duck Cloth, this durable, 7 oz. closely woven 100% cotton fabric comes in a contemporary range of colors.
2. Audio. To
attenuate one source to allow another prominence. A "ducking
circuit" or "ducker" is often used to lower the background music when an announcement is made, for example.
From
http://www.rane.com/par-d.html:
ducker A
dynamic processor that lowers (or "ducks") the
level of one audio signal based upon the level of a second audio signal. A typical application is paging: A ducker senses the presence of audio from a paging
microphone and triggers a reduction in the output level of the main audio signal for the duration of the
page signal. It restores the original level once the page message is over. Another use is for
talkover.
3. A slang term to "Get your head down or have it taken off."