panic-button

panic button

noun
1.
an alarm button for use in an emergency, as to summon help.
2.
push/hit/press the panic button, Informal. to give way to panic in a distressing situation.

Origin:
allegedly first used in reference to emergency bell systems on World War II bombers such as the B-17 and B-24

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
panic button
 
n
1.  a button or switch that operates any of various safety devices, for use in an emergency
2.  informal hit the panic button, press the panic button to react to a situation by demanding emergency action; become excited; panic

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Panic-button is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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