all-clear

all clear

noun
the signal that an air raid or other danger is over.

Origin:
1915–20

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
all clear
 
n
1.  a signal, usually a siren, indicating that some danger, such as an air raid, is over
2.  an indication that obstacles are no longer present; permission to proceed: he received the all clear on the plan

Collins English Dictionary - Complete & Unabridged 10th Edition
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