wear on a black hat

black hat

noun Informal.
1.
a villain, as in a cowboy movie; bad guy. Compare white hat.
Idioms
2.
wear/put on a black hat, to behave villainously.
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World English Dictionary
black hat
 
n
informal
 a.  a computer hacker who carries out illegal malicious hacking work
 b.  Compare white hat (as modifier): black-hat hackers

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