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red flag
- a warning flag
- Informal something serving as a warning of trouble or danger ahead
- Informal something that arouses anger, irritation, revolt, etc.
transitive verb red-flagged, red-flagging
to mark, designate, or otherwise call attention to as being risky, unsuitable, etc.
See red flag in American Heritage Dictionary 4
noun
- A warning signal.
- Something that demands attention or provokes an irritated reaction.
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