dead air

noun
the loss or suspension of the video or audio signal during a television or radio transmission.

Origin:
1940–45

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
dead air

noun
an inadvertent interruption in a broadcast during which there is no sound 
WordNet® 3.0, © 2006 by Princeton University.
Cite This Source
00:10
Dead air is always a great word to know.
So is gobo. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Example sentences
Despite all the dead air, the true believers say the odds of success are now
  better than ever.
Winter clothing is a system of three layers, loose enough to allow movement,
  yet provide a warm dead air space between layers.
The only thing that really insulates the body is dead air space, and it takes
  about one inch to do the job.
Every two seconds, there is a switch to the use of the frequency so the audio
  portion of the call is interrupted with dead air.
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