Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A warning signal.
  • n. Something that demands attention or provokes an irritated reaction.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A cue, warning, or alert; a sign or signal that something is wrong.

from the GNU version of the Collaborative International Dictionary of English

  • adj. See under Flag.
  • n. a flag of a red color, displayed as a signal of danger or token of defiance; the emblem of anarchists.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the emblem of socialist revolution
  • n. something that irritates or demands immediate action
  • n. a flag that serves as a warning signal

Etymologies

Sorry, no etymologies found.

Examples

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  • Why do I have a red flag on my screen whenever I'm on the home page these days? Was it decided democratically in my absence? Can't believe it's Google.

    March 18, 2009

  • The red flag flies at dawn.

    Seriously, I have one (actually two) of these on my work desk. They are a recently adopted office-wide signal (when placed atop the cubicle cabinet for all to see) that the person is on the phone or seriously busy and desires quiet.

    January 23, 2008