red flag noun 5red-flag verb 2forms 4 noun5 •A flag used as a signal that the race must be stopped immediately (and possibly restarted).Typically, a red flag is used when it rains or when the safety of the clean-up crews is in danger because there is too much debris or oil on the track. — 2005 •(figurative) A cue, warning, or alert; a sign or signal that something is wrong.Improper formatting is a red flag that you should look for other problems with the data. •(UK, historical) A flag formerly used by a railway guard to warn the driver not to start the train. •A red or predominantly red flag symbolizing a left-wing ideological movement, such as socialism, communism or the labour movement.Some chanted: "Pride, pride, national pride" and "Poland should be national not red or rainbow-coloured", in a reference to the red flag of the Soviet Union and the symbol of gay pride. — 2018 •(US, figurative) Something that will enrage a particular person; a red rag. red-flag verb2 •(figurative) To mark or identify something as suspicious, problematic or worthy of further scrutiny or immediate action. •To halt a race or session immediately due to unsafe conditions. formsred-flagged · red-flagging · red-flags · red flags
