Noun: red flag red flag
- A flag that serves as a warning signal
"we didn't swim at the beach because the red flag was up"
- Something that irritates or demands immediate action
"doing that is like waving a red flag in front of a bull"
- The emblem of socialist revolution
"Protesters waved red flags during the May Day demonstration"
Derived forms: red flags
Type of: alarm, alarum [archaic], alert, allegory, annoyance, annoying, emblem, flag, irritation, signal flag, vexation, warning signal
Encyclopedia: Red flag