1. a person or device that jacks; something used to lift or raise
Usage: often used in compounds (e.g., carjacker, hijacker)
2. a person who operates a jack (a mechanical lifting device)

Examples

• The carjacker was arrested after stealing the vehicle.
• A hijacker took control of the aircraft.
• The jacker carefully lifted the car to change the tire.
• He worked as a jacker at the construction site.
• The equipment included a hydraulic jacker for heavy loads.