Black-flag
a pirate flag, usually of black cloth with a white skull and crossbones on it; Jolly Roger.
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.
a signal given to an automobile racing driver to stop, usually because the car may have a dangerous problem that requires inspection.
Historical Examples
Harper’s Round Table, August 13, 1895 Various
Khartoum Campaign, 1898 Bennet Burleigh
noun
another name for the Jolly Roger
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a reducing flux consisting of finely divided carbon and potassium carbonate.
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