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green flag

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noun
  1. (in automobile racing) a green-colored flag that is used to signal the start of a race.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for green flag

Green Flag

noun
  1. an award given to a bathing beach that meets EU standards of cleanliness
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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