red light

Noun
  1. A cautionary sign of danger (synset 106887621)
    is a type of: visual signal - a signal that involves visual communication
    subtypes: idiot light - a colored warning light on an instrument panel (as for low oil pressure)
    same as: warning light
  2. The signal to stop (synset 106887547)
    is a type of: stoplight, traffic light, traffic signal - a visual signal to control the flow of traffic at intersections

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