blue peter

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.

Origin:
1815–25

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World English Dictionary
blue peter
 
n
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]

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