say goodbye

verb3

1. •
   To wish someone farewell upon their leaving.

   • Hello, hello / I don't know why you say goodbye, I say hello — 1967
2. •
   To separate from someone or something.

   • If we can't agree on whether to have children, maybe it's time to say goodbye.
3. •
   (figurative) To cease to have, or have to do, something.

   • Say goodbye to long waits at the airport with our new preboarding service.
   • You can say goodbye to your inheritance if you annoy your parents too much!