goodbye */

I UK [ˌɡʊdˈbaɪ] / US [ɡʊdˈbaɪ] interjection

Ways of saying goodbye:

Bye → the most common way of saying goodbye to a friend or someone you know well Cheerio/Cheers → an informal way of saying goodbye See you (later)/Catch you later → an informal way of saying goodbye to someone when you expect to see them again soon So long/See you around/(I'll) be seeing you → used for saying goodbye to someone you know well, when you are not sure when you will see them again Good night/Night → used for saying goodbye when you leave someone at night or before they go to bed Take care/Mind how you go → used when you say goodbye to someone you know well when they are leaving, in order to show that you care about them Safe journey → used when you say goodbye to someone you know well when they are leaving to go on a journey Nice to meet you → used for saying goodbye to someone when you have just met them for the first time
Examples:
Bye/Cheerio, thanks for coming! I'd better go now. I have to pick the children up from school. See you later! So long, it was really nice bumping into you. Good night. Thanks for a great party! Mind how you go. Give my regards to your parents. Safe journey! Give us a ring when you get home. Nice to meet you, Mr Mitchell. Have a good trip back to the States. ➡ hello

used when you are leaving someone or when someone is leaving you, or when you are finishing a telephone call. Bye is a more informal word and is a more common way of saying goodbye to a friend or to someone you know well

"Goodbye, Mr Taylor." "Goodbye, John."

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(it's) goodbye (to) something (and) hello (to) something — informal used for saying that one activity or period has ended and another one has started

II UK [ˌɡʊdˈbaɪ] / US [ɡʊdˈbaɪ] noun [countable]
Word forms "goodbye":
singular goodbye plural goodbyes

any word or phrase that you say when you leave someone or when someone leaves you

Emma left without even a goodbye.

say your goodbyes:

It was heartbreaking saying our goodbyes at the airport.

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say goodbye (to someone) — to use a word or phrase such as "goodbye" or "see you" when you leave someone or when someone leaves you

say/wave/kiss goodbye to something — to accept that you will not achieve, get, or keep something

This latest defeat means they can wave goodbye to any hopes of winning the championship.

wave goodbye (to someone) — to wave your hand when you leave someone or when they leave you

- kiss someone goodbye