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all clear

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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. 2009.
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all clear  
n.  A signal, usually by siren, that an air raid is over or a danger has passed.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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