WordReference Random House Unabridged Dictionary of American English © 2026
pan′ic but′ton, 
    1. an alarm button for use in an emergency, as to summon help.
    2. Idioms[Informal.] push or hit or press the panic button, to give way to panic in a distressing situation.
    • allegedly first used in reference to emergency bell systems on World War II bombers such as the B-17 and B-24

Collins Concise English Dictionary © HarperCollins Publishers::
panic button n
  1. a button or switch that operates any of various safety devices, for use in an emergency
  2. a button on the user interface of a social networking site that may be used to report offensive, obscene, or suspicious postings
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