red flag

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• March 2. 2016 from wordnet.princeton.edu

  red flag — noun — english

  a flag that serves as a warning signal; "we didn't swim at the beach because the red flag was up"

• March 2. 2016 from wordnet.princeton.edu

  red flag — noun — english

  the emblem of socialist revolution

• March 2. 2016 from wordnet.princeton.edu

  red flag — noun — english

  something that irritates or demands immediate action; "doing that is like waving a red flag in front of a bull"