IPA: /ˈteɪlˌlaɪt/
KK: /ˈteɪlˌlaɪt/
A red light located at the back of a vehicle that signals when the vehicle is stopping or turning.
Make sure your taillights are working before you drive at night.
Taillight → It is formed from "tail" (from Old English *tægel*, meaning the rear part) and "light" (from Old English *leoht*, meaning illumination). The word "taillight" refers to the light located at the rear part of a vehicle, providing illumination and signaling to others.
Think of the 'rear part' ('tail') of a vehicle being illuminated ('light') — that's why a taillight is the light at the back.