yellow light

noun
a yellow traffic light, usually preceding a signal halting traffic in a particular direction.

Origin:
1970–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To yellow light
Example sentences
The window was open, and the moon was flooding the cliffs and sea with a great
  tide of yellow light.
And while blue light causes these brain cells to fire, yellow light stops them.
But a simultaneous flash of yellow light can block that spike.
And when this light-sensitive protein binds to calcium, it radiates yellow
  light.
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