- a signal to stop, esp a red traffic signal in a system of traffic lights
- a danger signal
- a red lamp in a window of or outside a house indicating that it is a brothel
- (as modifier): a red-light district
WordReference Random House Unabridged Dictionary of American English © 2026
red′ light′,
- Transporta red lamp, used as a traffic signal to mean "stop.''
- an order or directive to halt an action, project, etc.:There's a red light on all unnecessary expenses.
- Gamesa children's running game in which players must stop when "Red light!'' is called.
- a signal of danger;
warning. - 1840–50
- Informal Termsto stop or deter by means of or as if with a red light.
- 1895–1900
Collins Concise English Dictionary © HarperCollins Publishers::
red light n
'red light' also found in these entries (note: many are not synonyms or translations):
brake light
- orthochromatic
- rear light
- red giant
- sidelight
- SPAD
- stoplight
- traffic light
- jump
- moving violation
- red
- red fire
- red-light district
- Storyville