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black market the illegal purchase or sale of goods in violation of restrictions such as price controls or rationing, customs laws, or the like. [2 definitions]
black-market to buy or sell on the black market.
black marketeer one who buys or sells in the black market.
Black Muslim a member of the Nation of Islam.
black nationalism (often caps.) a U.S. movement that advocates the establishment of a separate black nation.
blackout the extinguishing or hiding of all the lights of a city or region, as in a power failure or air raid. [4 definitions]
black out to lose consciousness; faint.
black pepper a spice made by grinding the whole dried berry of the pepper plant.
black power (sometimes caps.) the political and economic power of American blacks mobilized to force the granting of equal rights.
black raspberry a prickly shrub that grows in eastern North America and bears a dark purple berry. [2 definitions]
Black Sea a sea surrounded by Russia, Ukraine, Turkey, and the Balkan Peninsula.
black sheep one who differs from and is an embarrassment or disgrace to his or her family or group, because of disreputable behavior, lack of worldly success, or the like.
Black Shirt a member of a fascist military organization, esp. the former Italian one, whose uniform includes a black shirt.
blacksmith a person who makes, fits, and repairs horseshoes. [2 definitions]
blacksnake any of various dark-colored, usu. nonpoisonous North American snakes, esp. the black racer. [2 definitions]
blackstrap molasses a dark, thick molasses from which most of the sugar has been removed.
blackthorn a thorny European shrub with many branches, bearing white flowers and bluishblack, plumlike fruit. [2 definitions]
black tie the black bow tie worn on semiformal occasions with a dinner jacket or tuxedo. [2 definitions]
black-tie requiring semi-formal attire, esp., for the men, a black bow tie and dinner jacket or tuxedo.
blacktop a bituminous substance such as asphalt, used as pavement. [3 definitions]
black walnut a tall tree of eastern North America that has dark, hard wood valued for making furniture and other durable wood products. [3 definitions]