What is the meaning of Red_flag?
A flag that is red, especially associated with leftist revolutionary ideologies.
Used as a signal that the race must be stopped immediately (and possibly restarted).
A cue, warning, or alert; a sign or signal that something is wrong.
Something that will enrage a particular person; a red rag.
A flag formerly used by a railway guard to warn the driver not to start the train.
Source: wiktionary.orgSearch words containing