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yellow flag

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noun
  1. Nautical. quarantine flag.
  2. water flag.

Origin of yellow flag

First recorded in 1775–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for yellow flag

yellow flag

noun
  1. another name for quarantine flag
  2. See flag 3 (def. 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012