An area of a town where prostitution is concentrated.

(simile, colloquial) Asleep or unconscious, particularly if this has occurred suddenly and the sleep is deep.

A roadside camera, placed near a stoplight, designed to photograph vehicles that disobey a red traffic light.

(physics) Light (or other electromagnetic radiation) whose electric or displacement vector rotates in a plane perpendicular to the propagation direction with constant angular velocity

To dance or to move rhythmically to musical accompaniment, especially in a graceful or nimble manner.

(cinematography) The traditional cue to the members of a film crew at the beginning of a take.

(physics) A photoresistor.

(US) A discount or bargain.

(slang) To excite or arouse someone; to turn someone on.

To pass through the traffic light when the red light is illuminated. / (idiomatic) To enter a restricted area; to trespass. / (idiomatic) To falsely accuse someone of wrongdoing.