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mail flag

noun

, Nautical.
  1. a flag of the International Code of Signals symbolizing the letter Y, flown alone by a ship to indicate that it is carrying mail: a square flag with red and yellow diagonal stripes.
  2. any of various other flags indicating that a ship is carrying mail.


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Example Sentences

"This is a United States mail boat," and he pointed to the mail flag flying at the stern.

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