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A signal, usually by siren, that an air raid is over or a danger has passed.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Military) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the signal that a danger is over.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||all clear - a signal (usually a siren) that danger is over|
|2.||all clear - permission to proceed because obstacles have been removed|
permission - approval to do something; "he asked permission to leave"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.