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Definition of Quarantine flag
1. Noun. (nautical) a yellow flag hoisted by all ships on entering a harbor, to show that it has contagious or infectious disease aboard, or by a ship that has been quarantined ¹
¹ Source: wiktionary.com
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1. Noun. (nautical) a yellow flag hoisted by all ships on entering a harbor, to show that it has contagious or infectious disease aboard, or by a ship that has been quarantined ¹
¹ Source: wiktionary.com