say goodbye

say goodbye (third-person singular simple present says goodbye, present participle saying goodbye, simple past and past participle said goodbye)

1. (literal sense) To wish someone farewell upon their leaving.
2. (idiomatic) To separate from someone or something.

   Say goodbye to long waits at the airport with our new preboarding service.

   If we can't agree on whether to have children, maybe it's time to say goodbye.

• (separate from someone): take one's leave

• say hello
• wave goodbye