dead air

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

1940–45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To dead air
Example sentences
Despite all the dead air, the true believers say the odds of success are now
  better than ever.
Smoke alarm placement high on the sidewall or on the ceiling to avoid the dead
  air space.
Each layer of additional glazing improves the efficiency of a window, as dead
  air between panes prevents conduction of heat.
Remember that fires can easily start in dead air pockets and in crevices.
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