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Noun: red flag  red flag
  1. A flag that serves as a warning signal
    "we didn't swim at the beach because the red flag was up"
     
  2. The emblem of socialist revolution
     
  3. Something that irritates or demands immediate action
    "doing that is like waving a red flag in front of a bull"

Derived forms: red flags

Type of: alarm, alarum [archaic], alert, allegory, annoyance, annoying, emblem, flag, irritation, signal flag, vexation, warning signal

Encyclopedia: Red flag

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red dwarf star
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red giant star
red ginger
red goatfish
red goosefoot
red gram
red grouse
Red Guard
red gum