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Definition of Black flag
1. Noun. A flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship.
Exact synonyms: Blackjack, Jolly Roger, Pirate Flag
Generic synonyms: Flag
Terms within: Skull And Crossbones
Generic synonyms: Flag
Terms within: Skull And Crossbones
Definition of Black flag
1. Noun. A flag with a black color, used as a symbol of anarchism. ¹
¹ Source: wiktionary.com