all clear

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

1915–20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
all clear
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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