red flag Hear it!

red flag definition

red flag

  1. a warning flag
  2. Informal something serving as a warning of trouble or danger ahead
  3. Informal something that arouses anger, irritation, revolt, etc.
red-flag definition

red·-flag (red′flag′)

transitive verb red-flagged -·flagged′, red-flagging -·flag′·ging

to mark, designate, or otherwise call attention to as being risky, unsuitable, etc.

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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