Definitions from Wiktionary (red flag)

▸ noun:  (literally) A flag that is red, especially associated with leftist revolutionary ideologies.
▸ noun:  (motor racing) Used as a signal that the race must be stopped immediately (and possibly restarted).
▸ noun:  (informal) A cue, warning, or alert; a sign or signal that something is wrong.
▸ noun:  (idiomatic, US) Something that will enrage a particular person; a red rag.
▸ noun:  (rail transport, UK) A flag formerly used by a railway guard to warn the driver not to start the train.






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