red light

a 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.
a children's running game in which players must stop when “Red light!” is called.
a signal of danger; warning.

1840–50 Unabridged


verb (used with object), red-lighted, red-lighting.
Informal. to stop or deter by means of or as if with a red light.

1895–1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To red light
World English Dictionary
red light
1.  a signal to stop, esp a red traffic signal in a system of traffic lights
2.  a danger signal
3.  an instruction to stop or discontinue
4.  a.  a red lamp in a window of or outside a house indicating that it is a brothel
 b.  (as modifier): a red-light district

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Printer then flashes red light, demanding new cartridge.
He could stay in the fort, the red blanket casting a red light on everything
Or maybe you've stopped next to them at a red light and they're checking emails.
The next time the red light of violence shone out it seemed of no importance,
  an irrelevant horror.
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