quarantine flag


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quarantine flag

n
(Nautical Terms) nautical the yellow signal flag for the letter Q, flown alone from a vessel to indicate that there is no disease aboard and to request pratique or, with a second signal flag, to indicate that there is disease aboard. Also called: yellow flag or yellow jack
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At the port, you are instructed to fly the yellow quarantine flag and notify Customs of your arrival.
I have never seen the yellow quarantine flag of the U.
As you enter each port, fly the yellow quarantine flag and notify Customs of your arrival immediate