taillamp
/ˈteɪlˌlæmp/
noun
- A red light at the back of a vehicle that turns on when the headlights are on, making the vehicle visible to drivers behind it.
- The police officer pulled him over because his taillamp was not working.
- A bright taillamp helps prevent rear-end collisions in foggy weather.
- I noticed that my car's taillamp was broken, so I replaced it before driving at night.