red light

noun
1.
a red lamp, used as a traffic signal to mean “stop.”
2.
an order or directive to halt an action, project, etc.: There's a red light on all unnecessary expenses.
3.
a children's running game in which players must stop when “Red light!” is called.
4.
a signal of danger; warning.
Origin:
1840–50

00:10
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a stew of meat, vegetables, potatoes, etc.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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Dictionary.com Unabridged

red-light

[red-lahyt]
verb (used with object), red-light·ed, red-light·ing.
Informal. to stop or deter by means of or as if with a red light.
Origin:
1895–1900

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To red light
Collins
World English Dictionary
red light
 
—n
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
Cite This Source
Example sentences
On city streets, it's legal to right at a red light after stopping.
So instead of hitting a red light you'll annoy all the drivers behind you by
  slowing down to avoid it.
On the right is pretty much the same view, but instead of red light, they used
  blue-green-infrared.
He could stay in the fort, the red blanket casting a red light on everything
  inside.
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