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Definitions

red flag

NOUN
warning signal
Synonyms
WEAK
casus belli delicate subject red light red rag sore point

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The incident happened at Station Corner and a red flag brought the session to a close.

From BBC • May 7, 2026

So this retreat is a bit of a red flag.

From Barron's • May 4, 2026

“I think they need to rethink their financial plan because that’s a huge red flag they’re off track,” Bunio said.

From MarketWatch • Apr. 23, 2026

Ratios in the double-digits are a classic red flag.

From The Wall Street Journal • Apr. 21, 2026

“When you change the things you do because you’re scared of the way someone will react, that’s the red flag you need to pay attention to.”

From "Red Flags and Butterflies" by Sheryl Azzam