schakelaar

noun
  1. A device used to open or close an electric circuit, typically used to control the flow of electricity to a device or appliance. noun
    He flipped the schakelaar to turn on the lights.
    The schakelaar on the wall controls the ceiling fan.
  2. A person or thing that facilitates a change or transition between states or activities. noun
    As a project manager, she acts as a schakelaar between the development team and the clients.
    The new policy served as a schakelaar for improving company efficiency.