Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun red_light

2 senses of red light

Sense 1
red light, warning light -- (a cautionary sign of danger)
       => visual signal -- (a signal that involves visual communication)

Sense 2
red light -- (the signal to stop)
       => traffic light, traffic signal, stoplight -- (a visual signal to control the flow of traffic at intersections)