red lights
Intersection halt signals
Red lights are traffic signals commanding vehicles to stop.
Running a red light means ignoring this command and proceeding through an intersection illegally.
Red lights also mark a red-light district—an area where prostitution or sex-oriented businesses operate, from the colored lamps that historically signaled brothels.
Figuratively, a red light is any warning or prohibition: The project got a red light from management.
- stoplightIntersection flow controller
- traffic stopPolice halting a motorist
- haltComplete sudden stop
- signalMessage-conveying cue
- brakeDevice to slow motion
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red lightsgreen lights
Signals indicating permission
green light · all clear · go-ahead · green flag · thumbs up
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