blue peter

blue peter

n. Nautical A blue flag with a white square in the center, flown to signal that a ship is ready to sail.

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[From the fact that it represents the letter P in the International Code of Signals.]

blue peter

n (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]

blue′ pe′ter

n. 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. [1815–25]

Thesaurus

Noun

1.

blue peter - a blue flag with a white square in the center indicates that the vessel is ready to sailcode flag, nautical signal flag - one of an international code of flag signals used between ships