Black-hat
a villain, as in a cowboy movie; bad guy.
Digital Technology. a hacker who violates the security of a system for personal profit or for the gratification of causing damage.
wear / put on a black hat, to behave villainously.
noun
(informal)
a computer hacker who carries out illegal malicious hacking work
(as modifier): black-hat hackers Compare white hat
A villain; heavy: The only way I can do that is to make you the black hat/ This time, perhaps, there are black hats on both sides
he badge or symbol of a villain: Companies have this black hat on when they go to court
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sheepberry.
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a war fought in northern Illinois and present-day southern Wisconsin, 1831–32, in which U.S. regulars and militia with Indian allies defeated the Sauk and Fox Indians, led by Chief Black Hawk, attempting to recover lost hunting grounds.
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a small, black-tipped, fatty mass in a skin follicle, especially of the face; comedo. any of several birds having a head that is black, as the greater scaup, Aythya marila. Also called enterohepatitis. Veterinary Pathology. a malignant, infectious disease of turkeys, chickens, and many wild birds, caused by a protozoan parasite, Histomonas meleagridas, attacking especially […]
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See under fireworm (def 1). the larva of any of several moths, as Rhopobota naevana (black-headed fireworm) which feeds on the leaves of cranberries and causes them to wither. glowworm.