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A blue flag with a white square in the center, flown to signal that a ship is ready to sail.
[From the fact that it represents the letter P in the International Code of Signals.]
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.
(Nautical Terms) a signal flag of blue with a white square at the centre, displayed by a vessel about to leave port
[C19: from the name Peter]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a blue flag with a white square in the center, designating the letter P in the International Code of Signals, flown by a vessel in port to indicate its imminent departure.
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.||blue peter - a blue flag with a white square in the center indicates that the vessel is ready to sail|
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