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.
- 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
Check pronunciation:
red flag