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red flag

noun
  1. the symbol or banner of a left-wing revolutionary party.
  2. a danger signal.
  3. something that provokes an angry or hostile reaction: The talk about raising taxes was a red flag to many voters.
  4. Also called powder flag. Nautical. a red burgee, designating in the International Code of Signals the letter “B,” flown by itself to show that a vessel is carrying, loading, or discharging explosives or highly inflammable material.
  5. (initial capital letters) a war game the U.S. Air Force holds several times each year at Nellis Air Force Base, Nevada, to train personnel in air combat.
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Origin of red flag

First recorded in 1770–80

red-flag

[red-flag]
verb (used with object), red-flagged, red-flag·ging.
  1. to mark or draw attention to for a particular purpose: The department has red-flagged the most urgent repair work to be done.
  2. to provoke the attention of; alert; arouse: The animal's refusal to eat red-flagged the keeper that something was wrong.
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adjective
  1. of or relating to a red flag.
  2. intended or serving to emphasize, warn, incite, or provoke.
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Origin of red-flag

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for redflag

red flag

noun
  1. a symbol of socialism, communism, or revolution
  2. a warning of danger or a signal to stop
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Red Flag

noun
  1. the Red Flag a socialist song, written by James Connell (1852–1929), Irish political activist, in 1889
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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