black-flag

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:
1585–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
black flag
 
n
another name for the Jolly Roger

Collins English Dictionary - Complete & Unabridged 10th Edition
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