red flag

Pronunciation:			red flag
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WordNet Dictionary
	Definition:		[n]  something that irritates or demands immediate action; "doing that is like waving a red flag in front of a bull" [n]  the emblem of socialist revolution [n]  a flag that serves as a warning signal; "we didn't swim at the beach because the red flag was up"
	See Also:		alarm, alarum, alert, allegory, annoyance, annoying, emblem, flag, irritation, signal flag, vexation, warning signal