ଅର୍ଥ : A flag that serves as a warning signal.
ଉଦାହରଣ :
We didn't swim at the beach because the red flag was up.
ଅର୍ଥ : The emblem of socialist revolution.
ଅର୍ଥ : Something that irritates or demands immediate action.
ଉଦାହରଣ :
Doing that is like waving a red flag in front of a bull.