Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. Nautical A blue flag with a white square in the center, flown to signal that a ship is ready to sail.
Wiktionary
Etymologies
- From the fact that it represents the letter P in the International Code of Symbols. (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
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Lists
These user-created lists contain the word ‘blue peter’.
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blue phrases/words
how blue is used
blue band, blue bag, blue baby, blue ash, blue and white, blue apron, blue-aproned, blue-arsed fly, blue asbestos, blue-assed fly, blue-backed, blue balls and 370 more...
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The Aubrey/Maturin List I'm Gonna Mak...
I'm wading through Patrick O'Brian's Aubrey/Maturin novels one by one, and someday, I'll wade through them again and list all the words I learned while reading them.
Edit: I started ma...studdingsail, carronade, mumchance, grumlin-futtocks, crosscat-harpings, holystone, sennit, orlop, orchitis, negus, kevel, altumal and 1112 more...
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Hey! L...
for the same
ichthyarchy, thalassic, nip-cheese, cerement, manavalins, rockweed, polder, semipalmate, blue peter, curragh, crowfoot, cat and 158 more...
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Clearinghouse
For stuff to simply reside.
calcar, pinion, espadrille, antipodes, peregrine, cormorant, tanager, vireo, farrago, undervest, passerine, oscine and 881 more...
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inanimate objects with Christian names
idea lifted from a talkboard thread that'll probably be gone by the time you read this. Does jack-knife count? Guy-rope oughtn't.
Cliff…spinning jenny, lazy susan, catherine wheel, jolly roger, allen key, blue peter, rubber johnny, john, black maria, round robin, tin lizzie, jerry-can and 11 more...
Tweets
Looking for tweets for blue peter.

chained_bear A Sea of Words defines this as:
"A blue flag with a white rectangle in the middle, signifying the letter P in the international code, hoisted to signal that the ship is ready to sail, especially to recall the crew." (112)
Dictionary of Newfoundland English describes it as "seaman's jacket." Usage: '1898 The Record 10 So great was his emotion, Jess expected to see the buttons fly off his blue-peter... His manly bosom rose and fell with the regularity of a ferris-wheel.' (52) Feb 29, 2008