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