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the signal that an air raid or other danger is over.
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for
a signal, usually a siren, indicating that some danger, such as an air raid, is over
an indication that obstacles are no longer present; permission to proceed:
he received the all clear on the plan
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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