Define “to dip the lights”:

1. Turning off the high beam and turning on the fog lights
2. Changing the height of the parking beam
3. Reverting from low beam to high beam.
4. Correct answer: Reverting from high beam to low beam.

Why'Dimming the lights' means switching the headlights from high beam to low beam. Fog lights and parking lights have nothing to do with it.