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Definition of Blue peter
1. Noun. A blue flag with a white square in the center indicates that the vessel is ready to sail.
Definition of Blue peter
1. Noun. (nautical) A blue signal flag with a white rectangle in the centre, signifying "P". When flown alone, indicates that a ship is ready to sail, requiring all crew members and passengers to return on board. ¹
¹ Source: wiktionary.com