black hat

[ blak-hat ]
/ ˈblæk ˈhæt /

noun Informal.

a villain, as in a cowboy movie; bad guy.
Also called black hat hack·er .Computers. a hacker who violates the security of a system without the knowledge or consent of the owner or developer, as for personal profit or for the gratification of causing damage.

QUIZZES

WHO SAID IT: A QUIZ ON PRESIDENTIAL WIT AND WISDOM

Think you know your presidents? Take this quiz and see if you can match the style, wit, and ideology of these memorable lines to the right POTUS.
Question 1 of 9
“I do believe that the buck stops here, that I cannot rely upon public opinion polls to tell me what is right. I do believe that right makes might and that if I am wrong, 10 angels swearing I was right would make no difference.”

Idioms for black hat

    wear / put on a black hat, to behave villainously.
Compare white hat.

Origin of black hat

First recorded in 1955–60 for def. 1, and in 1990–95 for def. 2; from the black hat worn by the villain in a cowboy movie

OTHER WORDS FROM black hat

black-hat, black-hat·ted, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for black hat

black hat

noun

informal
  1. a computer hacker who carries out illegal malicious hacking work
  2. (as modifier)black-hat hackers Compare white hat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012