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English definition of “hack”

hack

verb (INFORMATION)    /hæk/
[I or T] to get into someone else's computer system without permission in order to find out information or do something illegal: Computer hacking has become very widespread over the last decade. A programmer had managed to hack into some top-secret government data. He claimed they had spied on him and tried to hack his computer.Operating computers [I or T] to use someone else's phone system without permission, especially to listen to their spoken messages: Police told the actor that his phone had been hacked.
(Definition of hack verb (INFORMATION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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