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We found one dictionary with English definitions that includes the word blue peter: Click on the first link on a line below to go directly to a page where "blue peter" is defined. General (1 matching dictionary) blue+peter: Webster's New World College Dictionary, 4th Ed. [home, info]

Quick definitions from WordNet (blue peter) ▸ noun:  a blue flag with a white square in the center indicates that the vessel is ready to sail