white alert
Americannoun
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(in military or civilian defense) an all-clear signal, directive, etc., indicating that the danger of air raid no longer exists.
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a return to normal conditions following an attack or a threat of attack.
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
