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English definition of “hijack”

hijack

verb [T]     /ˈhaɪdʒæk/
to take control of something, such as another person's plan, a system, or a meeting for your own advantage: The association is annoyed that its campaign has been hijacked by pin-striped PR men.
IT to take control of a computer belonging to someone else without their permission, especially for illegal purposes: Hundreds of the department's powerful computers were hijacked by hackers, who used them to send spam email.
(Definition of hijack verb from the Cambridge Business English Dictionary © Cambridge University Press)
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