- a flag that is all or mostly black, esp. such a flag flown by a pirate ship
- in auto racing, a signal to a driver during a race, made by waving a solid black flag, indicating that the driver must stop and consult an official
A Jolly Roger.
transitive verbblack-flagged, black-flag·ging, black-flags Sports
To signal (the driver of a racing car) to proceed immediately to the pits.
(plural black flags)
- A flag with a black color, used as a symbol of anarchism.