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black flag

noun
1.
a pirate flag, usually of black cloth with a white skull and crossbones on it; Jolly Roger.
2.
a flag having two yellow and two black squares, signifying the letter L in the International Code of Signals: formerly so called when used by itself to indicate the presence of cholera on board a vessel.
3.
a signal given to an automobile racing driver to stop, usually because the car may have a dangerous problem that requires inspection.
Also called blackjack (for defs 1, 2).
Origin
1585-1595
1585-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for black-flag

black flag

noun
1.
another name for the Jolly Roger
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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