panic bar

noun
a bar that spans an emergency exit door on its interior and opens the latch when pressure is applied.
Also called panic bolt.


Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Provide a panic bar or other means of exit on the inside of walk-in freezers to
  prevent trapping workers inside.
These codes often require panic bar hardware, single-release mechanisms, and
  other hardware requirements.
All panic bar and/or emergency stop switches must de-energize the entire system
  when activated.
They were unaware that the emergency-parking brake could be set and released
  with the park valve located near the panic bar.
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