stoplight
UK: ˈstɒplaɪt | US: ˈstɑːplaɪt
n. a traffic signal using colored lights to control the flow of vehicles
n. (less common) a light on a vehicle indicating braking or stopping
The word "stoplight" is a compound of "stop" (from Old English stoppian, meaning "to block or halt") and "light" (from Old English lēoht, meaning "brightness"). It emerged in the early 20th century with the rise of automated traffic signals, combining the functional purpose ("stop") with the medium ("light"). The term reflects the straightforward design of early traffic control systems, where lights visually communicated commands to drivers.
The stoplight turned red just as we approached the intersection.
Cyclists must obey stoplights to ensure road safety.
A malfunctioning stoplight caused traffic chaos downtown.
The car’s stoplight flickered, warning drivers behind to slow down.
Modern stoplights often include timers for pedestrian crossings.