1. a person who illegally seizes control of a vehicle, especially an aircraft, by force or threat
2. a person who takes over or appropriates something that belongs to another
Usage: figurative

Examples

• The hijacker demanded that the plane be flown to another country.
• Security measures at airports were increased to prevent hijackers from boarding planes.
• The hijacker was arrested after the standoff ended peacefully.
• Police negotiated with the hijacker for several hours.
• The meeting was disrupted by a hijacker who took over the microphone.
• Critics accused him of being a hijacker of other people’s ideas.