to take over a meeting, an idea or a system in a way that other people do not like, in order to achieve what you want 操纵◆Its annual meeting was hijacked by critics. 年会被反对者操纵了。
to take control of sth, especially sb's computer, without their agreement 控制（尤指未经同意控制某人的电脑）◆A hacker had hijacked their email system. 一名黑客控制了他们的电邮系统。