head ‧ light /ˈhedlaɪt/ BrE AmE ( also headlamp ) noun [countable usually plural]
1 . one of the large lights at the front of a vehicle, or the beam of light produced by this:
Suddenly, a figure appeared in my headlights.
2 . like a rabbit/deer caught in headlights so frightened or confused that you do not know what to do
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THESAURUS
■ on a car
▪ headlight ( also headlamp ) one of the two large lights at the front of a vehicle:
It was getting dark so she switched the headlights on.
▪ sidelight British English , parking light American English one of the two small lights next to the main lights, at the front and back of a car
▪ tail light one of the two red lights at the back of a vehicle
▪ indicator British English , turn signal American English one of the lights on a car that flash to show which way the car is turning