yellow light

/Y EH1 L OW0 L AY1 T/
noun
  1. 1

    (US) A traffic light, between the green light and the red light, indicating that vehicles should stop if safely possible.

  2. 2

    (idiomatic) Hesitance to proceed; limited approval or permission to proceed.

  3. 3

    Used other than figuratively or idiomatically: see yellow, light.