red flag

noun (slang)/red flæɡ/ 🔊 listen

red flag is a warning sign that something or someone is trouble. The opposite is a green flag (a positive sign).

📖 Meanings

1a warning sign, danger signal
"Lying is a big red flag." — (warning)
2green flag = a positive sign (opposite)
"Being kind is a green flag." — (positive sign)

🔄 Often confused

red flag vs green flag →warning sign →dealbreaker →

💬 Phrases

that's a red flagmajor red flaggreen flag
❓ What does “That's a red flag” mean?