red flag
noun/ˌred ˈflæɡ/
/ˌred ˈflæɡ/
- a flag used to warn people of danger
- You mustn’t swim when the red flag is flying.
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- a sign that something is not right or something bad may happen
- Teachers need to be alert to the red flags that signal children are experiencing difficulties.
- a red flag as a symbol of revolution or communism
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red flag