headlight

American  

[hed-lahyt] / ˈhɛdˌlaɪt /

noun

1. a light lights or lamp, usually equipped with a reflector, on the front of an automobile, locomotive, etc.

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headlight British  

/ ˈhɛdˌlaɪt /

noun

1. a powerful light, equipped with a reflector and attached to the front of a motor vehicle, locomotive, etc See also quartz-iodine lamp

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Etymology

Origin of headlight

An Americanism dating back to 1860–65; head + light ¹

Explanation

If you’re driving a car at night, you’re using your car’s headlights to light up the road in front of you. Headlights are the eyes of a car or train, beaming light to help you see what is ahead. The headlight is an important part of an automobile, and without it you could only drive at night where there are lots of street lights. On unlit roads, a deer might jump in front of your car and just stand there — staring into the light from your headlights. That’s where the expression “like a deer in headlights” comes from, and it means being really still after a shock, like you’re frozen in place.

Example Sentences

Tucker’s other innovations included a padded dashboard for safety, four-wheel independent suspension and a cyclops-like center headlight that rotated with the steering wheel to improve visibility around corners.

From The Wall Street Journal • Apr. 8, 2026

The RAC motoring organisation, which has campaigned on headlight dazzle, has repeatedly asked its members for their views.

From BBC • Feb. 18, 2026

Following an agreement by this forum, new vehicles are meant to have mandatory automatic headlight levelling by September 2027.

From BBC • Feb. 18, 2026

Additionally, please take good care to notice signage regarding segments of the highway where daytime headlight use is required.

From Los Angeles Times • Dec. 29, 2025

Then I flip on the headlight, and the path ahead of me fills with bugs dodging in the beam.

From "Merci Suárez Changes Gears" by Meg Medina

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