blue peter

noun Nautical.

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.



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Origin of blue peter

First recorded in 1815–25 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for blue peter

  • In some places it is known as a crow duck, but the proper local name here is "blue-peter."

  • The blue-peter was flying at the mast-head, and people hurrying away to say 'good-bye' for the last time.

    Tales Of The Trains|Charles James Lever
  • They observe the “Blue-Peter,” but without knowing aught of its significance.

British Dictionary definitions for blue peter

blue peter


a signal flag of blue with a white square at the centre, displayed by a vessel about to leave port

Word Origin for blue peter

C19: from the name Peter
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