Noun
(US) A traffic light, between the green light and the red light, indicating that vehicles should stop if safely possible.
(idiomatic) Hesitance to proceed; limited approval or permission to proceed.
Used other than figuratively or idiomatically: see yellow, light.
Source: en.wiktionary.orgFrom high black walls, gleaming vaguely with rain, Each yellow light looked down like a golden eye. They trembled from coign to coign, and tower to tower, Along high terraces quicker than dream they flew. And some of them steadily glowed, and some soon vanished, And some strange shadows threw. Conrad Aiken
On William Morris - He caught a crystal cupful of the yellow light of sunset, and persuading himself to dream it wine, drank it with a sort of smile. Sidney Lanier
Somebody who has been in a very bad wreck is going to be very conscientious about not speeding through a yellow light... You just learn so many good lessons when you go through a failed marriage. Amy Grant
I really just want to be warm yellow light that pours over everyone I love. Conor Oberst
I have these new policies toward my life, like 'I will not accelerate when I see the yellow light.' Elizabeth Gilbert
In setting goals and executing a strategy, Wanda is sophisticated. We have good systems and departments. If targets are not reached, a yellow light goes off. Wang Jianlin