noun
a flag that is red in color, typically used as a symbol of warning or danger
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The presence of multiple discrepancies in the financial report raised a red flag for the auditors.
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When he didn't show up for our date without any explanation, that was a red flag for me.
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Her constant need for attention is a major red flag in any relationship.
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The sudden drop in sales is a red flag that something is not right with our marketing strategy.