The AI-powered English dictionary
plural black flags
(especially) :
A flag with a black color, used as a symbol of anarchism. examples
A racing flag with a black color, used in auto racing to summon a driver to the pits. examples
third-person singular simple present black flags, present participle black flagging, simple past and past participle black flagged
(transitive) To summon (a racing driver) to the pits by waving a black flag. quotations examples
Jack Sears was driving the famous John Willment Cobra roadster "39PH." Sears was black flagged, and after returning to the track, drove a race that is still talked about today.
1994, Shelby Cobra, page 112
When a driver is black-flagged, he knows it.
2000, Mark Martin, NASCAR For Dummies, page 87