Bye-bye

Just as we were leaving the exam room the doctor waved his hand saying, 'bye-bye'.

Bye-bye!

"I'll be here again on Friday, so see you then. Bye-Bye." "Yeah, I'll be off now."

Bye-bye, little old lady!

It’s a fine day and the sooner I get started the longer I can be out, so bye-bye till later on, as we are going to see Barnum’s circus.

Bye bye! Let's play again some time!

Brush your teeth, it's time to go bye-bye.

"[H]e came to the gate of the city; and finding it shut lay him down and went to by-by!"