Red Light Definition

noun
Any danger or warning signal; specif., a red lamp, flare, etc.
Webster's New World
A red signal on a traffic light, indicating that a vehicle should come to a full stop.
Webster's New World
A command to stop.
American Heritage

A sign of a brothel.

Wiktionary
(idiomatic) Denial to proceed. Ruling out of any possibility.
Wiktionary
Synonyms:
  • warning light

Other Word Forms of Red Light

Noun

Singular:
red light
Plural:
red-lights

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red light