immobilizer

/ɪˈmoʊbəlaɪzər/
noun
  1. A device or system that prevents a vehicle from being started or moved, especially as an anti-theft measure.
    • Most modern cars come with an electronic immobilizer that stops the engine without the correct key.
    • The thief could not steal the motorcycle because of its built-in immobilizer.
    • She installed an aftermarket immobilizer to protect her vintage car from theft.
  2. A person or thing that prevents movement or action.
    • The heavy traffic acted as an immobilizer, keeping everyone stuck on the highway.
    • In the hospital, the splint served as an immobilizer for the injured finger.
    • The new regulations were an immobilizer for the company's expansion plans.
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